message: build/configure: silence some additional warnings
diff: @@ -46,6 +46,8 @@ c.append('cflags', '-D_DEFAULT_SOURCE -D_BSD_SOURCE -D_XOPEN_SOURCE=700')
  c.append('cflags', '-Wall -Wextra -pedantic')
  c.append('cflags', '-Wundef')
  c.append('cflags', '-Wno-unused-parameter')
  +c.append('cflags', '-Wno-unused-variable')
  +c.append('cflags', '-Wno-c99-extensions')
  c.append('cflags', '-Woverloaded-virtual')
  c.append('cflags', '-Werror=return-type')
  c.append('cflags', '-Wtype-limits')
  