fix arm target compile errors.

Makefile.common

@@ -22,6 +22,7 @@ ifeq ($(CPU_ARCH), x86_32)
 SOURCES_ASM += $(CORE_DIR)/x86/x86_stub.S
 endif
 ifeq ($(CPU_ARCH), arm)
+SOURCES_C   += $(CORE_DIR)/arm/warm.c
 SOURCES_ASM += $(CORE_DIR)/arm/arm_stub.S \
 	$(CORE_DIR)/arm/video_blend.S
 endif

common.h

@@ -224,7 +224,7 @@ typedef u32 fixed8_24;
 #include "SDL.h"
 #endif
 #include "cpu.h"
-#include "memory.h"
+#include "gba_memory.h"
 #include "video.h"
 #include "input.h"
 #include "sound.h"