Accept -Wp,args
Accept -Wp,args

These are preprocessor cmdline arguments, but even in GCC they
aren't specified but rather left as being subject to changes.
Nobody should use them, but let's to a half-assed attempt
at accepting them.

andreiw/tinycc,run4flat/tinycc,mingodad/tinycc,mirror/tinycc,andreiw/tinycc,mingodad/tinycc,mirror/tinycc,andreiw/tinycc,run4flat/tinycc,mirror/tinycc,run4flat/tinycc,code4game/tinycc,code4game/tinycc,avih/tinycc,mingodad/tinycc,run4flat/tinycc,mirror/tinycc,code4game/tinycc,avih/tinycc,mingodad/tinycc,avih/tinycc,avih/tinycc,run4flat/tinycc