NX: GCC15 hotfix

Author: MotoLegacy

Makefile.nx

@@ -133,7 +133,7 @@ ARCH	:=	-march=armv8-a -mtune=cortex-a57 -mtp=soft -fPIE -mcpu=cortex-a57+crc+fp
 CFLAGS	:=	-g -fpermissive -Wall -O3 -fno-strict-aliasing -fomit-frame-pointer -ffunction-sections \
 			$(ARCH) $(DEFINES)
 
-CFLAGS	+=	$(INCLUDE) -D__SWITCH__
+CFLAGS	+=	$(INCLUDE) -D__SWITCH__ -std=gnu99
 
 CXXFLAGS	:= $(CFLAGS) -fno-rtti -fno-exceptions -std=gnu++11