Disable optional compiler errors

`-Wall -Werror` is fragile for released software, because any new version of
the compiler can introduce new warnings, in which case the project will fail
to build. These options should only be used by the project's developers.

Author: rocallahan

GNUmakefile

@@ -83,8 +83,8 @@ ifeq ($(BUILD),yes)
 endif
 
 PYTHON = python3
-C_FLAGS_OPT = -Wall -Wextra -Werror
-CXX_FLAGS_OPT = -Wall -Wextra -Werror
+C_FLAGS_OPT = 
+CXX_FLAGS_OPT =
 export C_FLAGS_OPT
 export CXX_FLAGS_OPT