syscall_format test - make some lines optional

Make some lines in the match file optional, those
which were made optional in bb109398

test/libcintercept3.log.match

@@ -170,8 +170,8 @@ $(S) $(XX) -- madvise((null), 0, 2) = ?
 $(S) $(XX) -- madvise((null), 0, 2) = 22
 $(S) $(XX) -- mlock(0x123000, 0x3000) = ?
 $(S) $(XX) -- mlock(0x123000, 0x3000) = 22
-$(S) $(XX) -- mlock2(0x123000, 0x3000, 0x0) = ?
-$(S) $(XX) -- mlock2(0x123000, 0x3000, 0x0) = 22
+$(OPT)$(S) $(XX) -- mlock2(0x123000, 0x3000, 0x0) = ?
+$(OPT)$(S) $(XX) -- mlock2(0x123000, 0x3000, 0x0) = 22
 $(S) $(XX) -- munlock(0x123000, 0x3000) = ?
 $(S) $(XX) -- munlock(0x123000, 0x3000) = 22
 $(S) $(XX) -- mlockall(0x1) = ?
@@ -696,8 +696,8 @@ $(S) $(XX) -- mq_getsetattr(0x1, 0x123000, 0x234000) = ?
 $(S) $(XX) -- mq_getsetattr(0x1, 0x123000, 0x234000) = 22
 $(S) $(XX) -- kexec_load(0x1, 0x2, 0x123000, 0x2) = ?
 $(S) $(XX) -- kexec_load(0x1, 0x2, 0x123000, 0x2) = 22
-$(S) $(XX) -- kexec_file_load(0x1, 0x2, 0x3, $(XX), 0x2) = ?
-$(S) $(XX) -- kexec_file_load(0x1, 0x2, 0x3, $(XX), 0x2) = 22
+$(OPT)$(S) $(XX) -- kexec_file_load(0x1, 0x2, 0x3, $(XX), 0x2) = ?
+$(OPT)$(S) $(XX) -- kexec_file_load(0x1, 0x2, 0x3, $(XX), 0x2) = 22
 $(S) $(XX) -- waitid(0x1, 0x2, 0x123000, 0x4) = ?
 $(S) $(XX) -- waitid(0x1, 0x2, 0x123000, 0x4) = 22
 $(S) $(XX) -- add_key(0x123000, 0x234000, 0x123000, 0x234000, 0x1) = ?