Disable -Wmissing-braces

This warning is somewhat insignificant for most of what we do; just
warns about missing braces for sub-structures, but most of the time it
wrongly triggers on = {0}, which is a standard way of initializing a
structure to 0 in C.

CMakeLists.txt

@@ -26,7 +26,7 @@ endif()
 
 if(CMAKE_COMPILER_IS_GNUCC OR CMAKE_COMPILER_IS_GNUCXX OR CMAKE_COMPILER_IS_CLANG)
 	set(CMAKE_CXX_FLAGS "-Wall -Wextra -Wno-unused-function -Werror-implicit-function-declaration -Wno-missing-field-initializers ${CMAKE_CXX_FLAGS} -fno-strict-aliasing")
-	set(CMAKE_C_FLAGS "-Wall -Wextra -Wno-unused-function -Werror-implicit-function-declaration -Wno-missing-field-initializers ${CMAKE_C_FLAGS} -std=gnu99 -fno-strict-aliasing")
+	set(CMAKE_C_FLAGS "-Wall -Wextra -Wno-unused-function -Werror-implicit-function-declaration -Wno-missing-braces -Wno-missing-field-initializers ${CMAKE_C_FLAGS} -std=gnu99 -fno-strict-aliasing")
 
 	option(USE_LIBC++ "Use libc++ instead of libstdc++" ${APPLE})
 	if(USE_LIBC++)