RFA: Restore ability to build zlib in a srcdir == builddir

[Nick Clifton]

Hi Guys,

  The patch below allows the zlib library to be built when the build
  directory is the same as the source directory.  This patch has been in
  the binutils/gdb sources for a while now, but unfortunately was never
  copied to gcc.  So I am trying to right that mistake now.

  OK to apply ?

Cheers
  Nick

./ChangeLog
        * zlib/configure.ac: Restore old behaviour of only enabling
        multilibs when a target subdirectory is defined.  This allows
        building with srcdir == builddir.
        * zlib/configure: Regenerate.

diff --git a/zlib/configure.ac b/zlib/configure.ac
index fb8d943905..57d6fa56b6 100644
--- a/zlib/configure.ac
+++ b/zlib/configure.ac
@@ -4,7 +4,9 @@ AC_PREREQ(2.64)
 AC_INIT
 AC_CONFIG_SRCDIR([zlib.h])
 
-AM_ENABLE_MULTILIB(, ..)
+if test -n "${with_target_subdir}"; then
+  AM_ENABLE_MULTILIB(, ..)
+fi
 
 AC_CANONICAL_SYSTEM