mesa: expose ARB_gpu_shader5 in the compatibility profile

Gallium drivers don't expose this yet due to:
    "st/mesa: use PIPE_CAP_GLSL_FEATURE_LEVEL_COMPATIBILITY"
Reviewed-by: Timothy Arceri <tarceri@itsqueeze.com>

src/mesa/drivers/dri/i965/intel_extensions.c

@@ -224,8 +224,10 @@ intelInitExtensions(struct gl_context *ctx)
       ctx->Extensions.ARB_conservative_depth = true;
       ctx->Extensions.ARB_derivative_control = true;
       ctx->Extensions.ARB_framebuffer_no_attachments = true;
-      ctx->Extensions.ARB_gpu_shader5 = true;
-      ctx->Extensions.ARB_gpu_shader_fp64 = devinfo->has_64bit_types;
+      if (ctx->API != API_OPENGL_COMPAT) {
+         ctx->Extensions.ARB_gpu_shader5 = true;
+         ctx->Extensions.ARB_gpu_shader_fp64 = devinfo->has_64bit_types;
+      }
       ctx->Extensions.ARB_shader_atomic_counters = true;
       ctx->Extensions.ARB_shader_atomic_counter_ops = true;
       ctx->Extensions.ARB_shader_clock = true;

src/mesa/main/extensions_table.h

@@ -74,7 +74,7 @@ EXT(ARB_framebuffer_sRGB                    , EXT_framebuffer_sRGB
 EXT(ARB_get_program_binary                  , dummy_true                             , GLL, GLC,  x ,  x , 2010)
 EXT(ARB_get_texture_sub_image               , dummy_true                             , GLL, GLC,  x ,  x , 2014)
 EXT(ARB_gl_spirv                            , ARB_gl_spirv                           ,  x,  GLC,  x ,  x , 2016)
-EXT(ARB_gpu_shader5                         , ARB_gpu_shader5                        ,  x , GLC,  x ,  x , 2010)
+EXT(ARB_gpu_shader5                         , ARB_gpu_shader5                        , GLL, GLC,  x ,  x , 2010)
 EXT(ARB_gpu_shader_fp64                     , ARB_gpu_shader_fp64                    ,  x , GLC,  x ,  x , 2010)
 EXT(ARB_gpu_shader_int64                    , ARB_gpu_shader_int64                   ,  x , GLC,  x ,  x , 2015)
 EXT(ARB_half_float_pixel                    , dummy_true                             , GLL, GLC,  x ,  x , 2003)