Tweak the compiler flags in the Makefile.

In particular, compile with -Wall -Wextra and disable only the
unused-parameter and missing-field-initializers warnings. This
should help to keep the build clean for GCC/Clang.

Change-Id: I420f2f0d818d0d4afca51f8ea62cd8db150ffece
Reviewed-on: https://code-review.googlesource.com/3791
Reviewed-by: Paul Wankadia <junyer@google.com>
1 file changed