Don't assume Perl lives in /usr/bin; do a proper test for it.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@1389 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/cachegrind/cg_annotate.in b/cachegrind/cg_annotate.in
index d6f1848..67d5af3 100644
--- a/cachegrind/cg_annotate.in
+++ b/cachegrind/cg_annotate.in
@@ -1,4 +1,4 @@
-#! /usr/bin/perl -w
+#! @PERL@ -w
 
 ##--------------------------------------------------------------------##
 ##--- The cache simulation framework: instrumentation, recording   ---##