Some existing tests build .s and .d files for run_dump_test, using an
absolute #source: line in the .d file.  This patch changes that scheme
a little to instead use "#source: ./..." in .d files rather than
"#source: $objdir/...", which is more useful in cases where the .d
file is not generated.

This allows RX gas test files to be built in the build directory,
rather than in a source directory (which might be read-only).

binutils/
	* testsuite/lib/binutils-common.exp (run_dump_test): Don't prepend
	$srcdir/$subdir to source file name if it starts with "./".
gas/
	* testsuite/gas/rx/rx.exp: Create generated test source in
	current directory.
	* testsuite/gas/rx/Xtod.d, * testsuite/gas/rx/abs.d,
	* testsuite/gas/rx/adc.d, * testsuite/gas/rx/add.d,
	* testsuite/gas/rx/and.d, * testsuite/gas/rx/bclr.d,
	* testsuite/gas/rx/bcnd.d, * testsuite/gas/rx/bfmov.d,
	* testsuite/gas/rx/bmcnd.d, * testsuite/gas/rx/bnot.d,
	* testsuite/gas/rx/bra.d, * testsuite/gas/rx/brk.d,
	* testsuite/gas/rx/bset.d, * testsuite/gas/rx/bsr.d,
	* testsuite/gas/rx/btst.d, * testsuite/gas/rx/clrpsw.d,
	* testsuite/gas/rx/cmp.d, * testsuite/gas/rx/dabs.d,
	* testsuite/gas/rx/dadd.d, * testsuite/gas/rx/dbt.d,
	* testsuite/gas/rx/dcmp.d, * testsuite/gas/rx/ddiv.d,
	* testsuite/gas/rx/div.d, * testsuite/gas/rx/divu.d,
	* testsuite/gas/rx/dmov.d, * testsuite/gas/rx/dmul.d,
	* testsuite/gas/rx/dneg.d, * testsuite/gas/rx/dpopm.d,
	* testsuite/gas/rx/dpushm.d, * testsuite/gas/rx/dround.d,
	* testsuite/gas/rx/dsqrt.d, * testsuite/gas/rx/dsub.d,
	* testsuite/gas/rx/dtoX.d, * testsuite/gas/rx/emaca.d,
	* testsuite/gas/rx/emsba.d, * testsuite/gas/rx/emul.d,
	* testsuite/gas/rx/emula.d, * testsuite/gas/rx/emulu.d,
	* testsuite/gas/rx/fadd.d, * testsuite/gas/rx/fcmp.d,
	* testsuite/gas/rx/fdiv.d, * testsuite/gas/rx/fmul.d,
	* testsuite/gas/rx/fsqrt.d, * testsuite/gas/rx/fsub.d,
	* testsuite/gas/rx/ftoi.d, * testsuite/gas/rx/ftou.d,
	* testsuite/gas/rx/gprel.d, * testsuite/gas/rx/int.d,
	* testsuite/gas/rx/itof.d, * testsuite/gas/rx/jmp.d,
	* testsuite/gas/rx/jsr.d, * testsuite/gas/rx/machi.d,
	* testsuite/gas/rx/maclh.d, * testsuite/gas/rx/maclo.d,
	* testsuite/gas/rx/max.d, * testsuite/gas/rx/min.d,
	* testsuite/gas/rx/mov.d, * testsuite/gas/rx/movco.d,
	* testsuite/gas/rx/movli.d, * testsuite/gas/rx/movu.d,
	* testsuite/gas/rx/msbhi.d, * testsuite/gas/rx/msblh.d,
	* testsuite/gas/rx/msblo.d, * testsuite/gas/rx/mul.d,
	* testsuite/gas/rx/mulhi.d, * testsuite/gas/rx/mullh.d,
	* testsuite/gas/rx/mullo.d, * testsuite/gas/rx/mvfacgu.d,
	* testsuite/gas/rx/mvfachi.d, * testsuite/gas/rx/mvfaclo.d,
	* testsuite/gas/rx/mvfacmi.d, * testsuite/gas/rx/mvfc.d,
	* testsuite/gas/rx/mvfcp.d, * testsuite/gas/rx/mvfdc.d,
	* testsuite/gas/rx/mvfdr.d, * testsuite/gas/rx/mvtacgu.d,
	* testsuite/gas/rx/mvtachi.d, * testsuite/gas/rx/mvtaclo.d,
	* testsuite/gas/rx/mvtc.d, * testsuite/gas/rx/mvtcp.d,
	* testsuite/gas/rx/mvtdc.d, * testsuite/gas/rx/neg.d,
	* testsuite/gas/rx/nop.d, * testsuite/gas/rx/not.d,
	* testsuite/gas/rx/opecp.d, * testsuite/gas/rx/or.d,
	* testsuite/gas/rx/pop.d, * testsuite/gas/rx/popc.d,
	* testsuite/gas/rx/popm.d, * testsuite/gas/rx/push.d,
	* testsuite/gas/rx/pushc.d, * testsuite/gas/rx/pushm.d,
	* testsuite/gas/rx/r-bcc.d, * testsuite/gas/rx/r-bra.d,
	* testsuite/gas/rx/racl.d, * testsuite/gas/rx/racw.d,
	* testsuite/gas/rx/rdacl.d, * testsuite/gas/rx/rdacw.d,
	* testsuite/gas/rx/revl.d, * testsuite/gas/rx/revw.d,
	* testsuite/gas/rx/rmpa.d, * testsuite/gas/rx/rolc.d,
	* testsuite/gas/rx/rorc.d, * testsuite/gas/rx/rotl.d,
	* testsuite/gas/rx/rotr.d, * testsuite/gas/rx/round.d,
	* testsuite/gas/rx/rstr.d, * testsuite/gas/rx/rte.d,
	* testsuite/gas/rx/rtfi.d, * testsuite/gas/rx/rts.d,
	* testsuite/gas/rx/rtsd.d, * testsuite/gas/rx/sat.d,
	* testsuite/gas/rx/satr.d, * testsuite/gas/rx/save.d,
	* testsuite/gas/rx/sbb.d, * testsuite/gas/rx/sccnd.d,
	* testsuite/gas/rx/scmpu.d, * testsuite/gas/rx/setpsw.d,
	* testsuite/gas/rx/shar.d, * testsuite/gas/rx/shll.d,
	* testsuite/gas/rx/shlr.d, * testsuite/gas/rx/smovb.d,
	* testsuite/gas/rx/smovf.d, * testsuite/gas/rx/smovu.d,
	* testsuite/gas/rx/sstr.d, * testsuite/gas/rx/stnz.d,
	* testsuite/gas/rx/stz.d, * testsuite/gas/rx/sub.d,
	* testsuite/gas/rx/suntil.d, * testsuite/gas/rx/swhile.d,
	* testsuite/gas/rx/tst.d, * testsuite/gas/rx/utof.d,
	* testsuite/gas/rx/wait.d, * testsuite/gas/rx/xchg.d,
	* testsuite/gas/rx/xor.d: Add #source line.
ld/
	* testsuite/ld-elf/sec64k.exp: Use . rather than $objdir in
	generated source file names.
	* testsuite/ld-m68k/m68k-got.exp: Likewise.