make runcom compile on recent distributions

Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: NBlue Swirl <blauwirbel@gmail.com>

tests/runcom.c

@@ -13,15 +13,12 @@
 #include <linux/unistd.h>
 #include <asm/vm86.h>
 
-//#define SIGTEST
+extern int vm86 (unsigned long int subfunction,
+		 struct vm86plus_struct *info);
 
-#undef __syscall_return
-#define __syscall_return(type, res) \
-do { \
-	return (type) (res); \
-} while (0)
+#define VIF_MASK                0x00080000
 
-_syscall2(int, vm86, int, func, struct vm86plus_struct *, v86)
+//#define SIGTEST
 
 #define COM_BASE_ADDR    0x10100