make runcom compile on recent distributions

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

tests/runcom.c

diff --git a/tests/runcom.c b/tests/runcom.c
index 6380566..d60342b 100644
--- a/tests/runcom.c
+++ b/tests/runcom.c
@@ -13,16 +13,13 @@
 #include <linux/unistd.h>
 #include <asm/vm86.h>
 
+extern int vm86 (unsigned long int subfunction,
+		 struct vm86plus_struct *info);
+
+#define VIF_MASK                0x00080000
+
 //#define SIGTEST
 
-#undef __syscall_return
-#define __syscall_return(type, res) \
-do { \
-	return (type) (res); \
-} while (0)
-
-_syscall2(int, vm86, int, func, struct vm86plus_struct *, v86)
-
 #define COM_BASE_ADDR    0x10100
 
 static void usage(void)