Add gcc-style -W/-Wno- warning selections; -Wall; -Werror
Add gcc-style -W/-Wno- warning selections; -Wall; -Werror

Add gcc-style -Wxxx -Wno-xxx warning selection as an alternative to
-w+xxx/-w-xxx.

Add "all" as an alias for all (actual) warnings.

Add "error" to treat warnings as errors.

projedi/nasm,turingstudio/nasm,projedi/nasm,projedi/nasm,projedi/nasm,Distrotech/nasm,turingstudio/nasm,Distrotech/nasm,techkey/nasm,techkey/nasm,techkey/nasm,Distrotech/nasm,letolabs/nasm,turingstudio/nasm,turingstudio/nasm,Distrotech/nasm,techkey/nasm,projedi/nasm,letolabs/nasm,letolabs/nasm,techkey/nasm