SDL_assert.h: add inline asm (int $3) as SDL_TriggerBreakpoint for Watcom/x86 (also disable SIGTRAP case to !watcom, because watcom doesn't have SIGTRAP.) Partially fixes Bugzilla #3758.
diff --git a/include/SDL_assert.h b/include/SDL_assert.h
index e80de78..ab6868f 100644
--- a/include/SDL_assert.h
+++ b/include/SDL_assert.h
@@ -53,7 +53,9 @@ assert can have unique static variables associated with it.
#define SDL_TriggerBreakpoint() __debugbreak()
#elif ( (!defined(__NACL__)) && ((defined(__GNUC__) || defined(__clang__)) && (defined(__i386__) || defined(__x86_64__))) )
#define SDL_TriggerBreakpoint() __asm__ __volatile__ ( "int $3\n\t" )
-#elif defined(HAVE_SIGNAL_H)
+#elif defined(__386__) && defined(__WATCOMC__)
+ #define SDL_TriggerBreakpoint() { _asm { int 0x03 } }
+#elif defined(HAVE_SIGNAL_H) && !defined(__WATCOMC__)
#include <signal.h>
#define SDL_TriggerBreakpoint() raise(SIGTRAP)
#else