stop including "windows.h" everywhere

make sure sm_crash shows up in stack traces

stepmania/src/global.cpp

@@ -1,3 +1,23 @@
-/* This is just a dummy file for Win32 pre-compiled headers. */
 #include "global.h"
 
+#ifdef _WINDOWS
+#include "windows.h"
+void NORETURN sm_crash()
+{
+	// throws an exception that gets caught by the exception handler
+	DebugBreak();
+
+	/* Do something after calling DebugBreak, so the call/return isn't optimized
+	 * to a jmp; that way, this function will appear in backtrace stack traces. */
+	_asm nop;
+}
+#else
+void NORETURN sm_crash()
+{
+	*(char*)0=0;
+
+	/* This isn't actually reached.  We just do this to convince the compiler that the
+	 * function really doesn't return. */
+	while(1);
+}
+#endif