build: Check for linker flags on Linux

We can build Epoxy with different compilers on Linux, and they may not
support all the linker flags we wish to use, so we should check whether
or not they exist.

src/meson.build

@@ -50,7 +50,11 @@ epoxy_sources = sources + gen_sources
 common_ldflags = []
 
 if host_system == 'linux'
-  common_ldflags = [ '-Wl,-Bsymbolic', '-Wl,-z,relro', '-Wl,-z,now', ]
+  foreach f: [ '-Wl,-Bsymbolic', '-Wl,-z,relro', '-Wl,-z,now', ]
+    if cc.has_argument(f)
+      common_ldflags += f
+    endif
+  endforeach
 endif
 
 # Maintain compatibility with autotools; see: https://github.com/anholt/libepoxy/issues/108