Added signlong implementation

Author: Oldnemesis

lib/timidity/timidity/optcode.h

@@ -23,6 +23,11 @@
 
 #include "sysdep.h"
 
+static inline int32 signlong(int32 a)
+{
+ return ((a | 0x7fffffff) >> 30);
+}
+
 /* Generic version of imuldiv. */
 #define imuldiv8(a, b) \
     (int32)(((int64)(a) * (int64)(b)) >> 8)