This makes it an error to not have a prototype in scope for
a function with external linkage. The flag is only enabled
for gcc due to -Werror=type not working with all compilers.
Originally committed as revision 22313 to svn://svn.ffmpeg.org/ffmpeg/trunk
elif enabled gcc; then
check_cflags -fno-tree-vectorize
check_cflags -Werror=implicit
+ check_cflags -Werror=missing-prototypes
elif enabled clang; then
check_cflags -Qunused-arguments
elif enabled armcc; then