nightly/bin/nightly: Handle libc.so being in /lib or /lib64.

git-svn-id: svn://svn.valgrind.org/valgrind/trunk@14443 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/nightly/bin/nightly b/nightly/bin/nightly
index 6057951..99b129f 100755
--- a/nightly/bin/nightly
+++ b/nightly/bin/nightly
@@ -213,11 +213,11 @@
 gcc_version="`gcc --version 2> /dev/null | head -1`"
 gdb_version="`gdb --version 2> /dev/null | head -1`"
 as_version="`as --version 2> /dev/null | head -1`"
-libc_so="`ls -1 /lib/libc.so.* | tail -1`"
+libc_so="`ls -1 /lib/libc.so.* /lib64/libc.so.* 2>/dev/null | tail -1`"
 libc="unknown"
 if [ "x$libc_so" != "x" ]; then
   if [ -e "$libc_so" -a -r "$libc_so" ]; then
-    libc="`/lib/libc.so.* | head -1`"
+    libc="`$libc_so | head -1`"
   fi
 fi
 libc=`echo $libc | sed "s/, by Roland.*//"`