make sure compiler supports warning flags

Some compilers (like gcc-3.3) don't support all the newer -W flags that we
are using.  So import the compiler check found in the kernel and test each
flag we add.  The := is important so we only do the compiler tests once
per `make` rather than every time we compile a file.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>

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