Make valgrind in the freebsd ports compilable with clang.

valgrind-patch-configure

--- configure~	2012-06-09 04:40:02.045104538 -0500
+++ configure	2012-04-10 17:22:13.567263417 -0500
@@ -5326,27 +5326,37 @@ gcc_version=`${CC} --version \
              | $SED 's/i686-apple-darwin11//' \
              | $SED 's/^[^(]*([^)]*)  *\([0-9.]*\).*$/\1/'`
 
+clang_version=`${CC} --version \
+             | head -n 1 \
+             | $SED 's/^.*version  *\([0-9.]*\).*$/\1/'`
+
 is_clang="notclang"
+cc_version="${gcc_version}"
 if test "x`${CC} --version | head -n 1 | $SED 's/\(clang\) version.*/\1/'`" = "xclang" ; then
    is_clang="clang"
+   cc_version="${clang_version}"
 fi
 
-case "${is_clang}-${gcc_version}" in
+case "${is_clang}-${cc_version}" in
      notclang-3.*)
-	{ $as_echo "$as_me:${as_lineno-$LINENO}: result: ok (${gcc_version})" >&5
-$as_echo "ok (${gcc_version})" >&6; }
+	{ $as_echo "$as_me:${as_lineno-$LINENO}: result: ok (${cc_version})" >&5
+$as_echo "ok (${cc_version})" >&6; }
 	;;
      notclang-4.*)
-	{ $as_echo "$as_me:${as_lineno-$LINENO}: result: ok (${gcc_version})" >&5
-$as_echo "ok (${gcc_version})" >&6; }
+	{ $as_echo "$as_me:${as_lineno-$LINENO}: result: ok (${cc_version})" >&5
+$as_echo "ok (${cc_version})" >&6; }
 	;;
      clang-2.9)
-	{ $as_echo "$as_me:${as_lineno-$LINENO}: result: ok (clang-${gcc_version})" >&5
-$as_echo "ok (clang-${gcc_version})" >&6; }
+	{ $as_echo "$as_me:${as_lineno-$LINENO}: result: ok (clang-${cc_version})" >&5
+$as_echo "ok (clang-${cc_version})" >&6; }
+	;;
+     clang-3.*)
+	{ $as_echo "$as_me:${as_lineno-$LINENO}: result: ok (clang-${cc_version})" >&5
+$as_echo "ok (clang-${cc_version})" >&6; }
 	;;
      *)
-	{ $as_echo "$as_me:${as_lineno-$LINENO}: result: no (${gcc_version})" >&5
-$as_echo "no (${gcc_version})" >&6; }
+	{ $as_echo "$as_me:${as_lineno-$LINENO}: result: no (${cc_version})" >&5
+$as_echo "no (${cc_version})" >&6; }
 	as_fn_error $? "please use gcc >= 3.0 or clang >= 2.9" "$LINENO" 5
 	;;
 esac