Fix compiler warnings with GCC 5

Since we compile with -Werror, the warnings were treated as errors. It even found a legitimate off-by-one error in the control setup menu.
DCurrent · Feb 8, 2017 · a91df8b · a91df8b
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commit a91df8b
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diff --git a/engine/Makefile b/engine/Makefile
@@ -529,7 +529,7 @@ OBJS            = $(MAIN)
 #----------------------------------------------------------------------------------------------------
 
 CFLAGS 	       += $(addprefix -I", $(addsuffix ", $(INCS))) $(ARCHFLAGS) -D$(TARGET_PLATFORM)
-CFLAGS 	       += -g -Wall -Werror -fsigned-char
+CFLAGS 	       += -g -Wall -Werror -fsigned-char -std=gnu99
 
 
 ifndef BUILD_GP2X