Added alloca support for cproc

Author: nmke-de

prune.c

@@ -8,6 +8,11 @@
 #define print(str) write(0, (str), strlen((str)))
 #define input(var, limit) read(1, (var), (limit))
 
+// Support cproc alloca
+#ifndef alloca
+#define alloca __builtin_alloca
+#endif
+
 /*
 removes all entries in filename which are older than now.
 */