Patch backported from upstream revision 30993 by a3li@gentoo.org.

diff -Naur ruby-1.8.7-p334.orig/ext/bigdecimal/bigdecimal.c ruby-1.8.7-p334/ext/bigdecimal/bigdecimal.c
--- ruby-1.8.7-p334.orig/ext/bigdecimal/bigdecimal.c	2010-06-08 09:49:18.000000000 +0200
+++ ruby-1.8.7-p334/ext/bigdecimal/bigdecimal.c	2011-05-31 20:53:23.268999218 +0200
@@ -2032,7 +2032,7 @@
 VP_EXPORT void *
 VpMemAlloc(U_LONG mb)
 {
-    void *p = xmalloc((unsigned int)mb);
+    void *p = xmalloc(mb);
     if(!p) {
         VpException(VP_EXCEPTION_MEMORY,"failed to allocate memory",1);
     }