Cleanup and fixes for compiler warnings

src/apple2.h

@@ -37,7 +37,7 @@
 #   define APPLE_ASSEMBLER_IS_BROKEN 1
 #   define         SN(foo) _##foo(%rip)
 #   define         SNX(foo, INDEX, SCALE) (_X8,INDEX,SCALE)
-#   if defined(__LP64__)
+#   ifdef __LP64__
 #       define     SNX_PROLOGUE(foo)  leaLQ   _##foo(%rip), _X8;
 #   else
 #       error "Building 32bit Darwin/x86 is not supported (unless you're a go-getter and make it supported)"

src/interface.c

@@ -1559,7 +1559,7 @@ static void *interface_thread(void *current_key)
 #endif
     in_interface = true;
 
-    switch ((int)current_key) {
+    switch ((__SWORD_TYPE)current_key) {
 #ifdef INTERFACE_CLASSIC
     case kF1:
         c_interface_select_diskette( 0 );

src/video/glvideo.c

@@ -723,7 +723,10 @@ static void gldriver_init_glut(GLuint fbo) {
 // renderer API
 
 void video_driver_init(void *fbo) {
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wpointer-to-int-cast"
     defaultFBO = (GLuint)fbo;
+#pragma GCC diagnostic pop
 #if defined(__APPLE__)
     gldriver_init_common();
 #elif USE_GLUT

src/x86/cpu-regs.h

@@ -36,7 +36,7 @@
     subLQ   SN(base_vmem), _XAX; \
     orLQ    _XAX, SP_Reg_X;
 
-#if __LP64__
+#ifdef __LP64__
 #   define SZ_PTR           8
 #   define ROR_BIT          63
 // x86_64 registers