configure.in: use RUBY_APPEND_OPTIONS

* configure.in: DLDFLAGS is defined in --with-opt-dir handler, so
  ${DLDFLAGS=} does not work now.  use RUBY_APPEND_OPTIONS instead.
  [ruby-dev:47855] [Bug #9256]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44297 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,9 @@
+Fri Dec 20 16:00:52 2013  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* configure.in: DLDFLAGS is defined in --with-opt-dir handler, so
+	  ${DLDFLAGS=} does not work now.  use RUBY_APPEND_OPTIONS instead.
+	  [ruby-dev:47855] [Bug #9256]
+
 Fri Dec 20 14:19:12 2013  NARUSE, Yui  <naruse@ruby-lang.org>
 
 	* configure.in (AC_ARG_WITH): use withval directly.

configure.in

@@ -2667,7 +2667,10 @@ if test "$with_dln_a_out" != yes; then
 			fi
 			rb_cv_dlopen=yes],
 	[darwin*], [	: ${LDSHARED='$(CC) -dynamic -bundle'}
-			: ${DLDFLAGS="${linker_flag}-undefined${linker_flag:+,}dynamic_lookup ${linker_flag}-multiply_defined${linker_flag:+,}suppress"}
+			RUBY_APPEND_OPTIONS(DLDFLAGS, [ \
+			    "${linker_flag}-undefined${linker_flag:+,}dynamic_lookup" \
+			    "${linker_flag}-multiply_defined${linker_flag:+,}suppress" \
+			    ])
 			: ${LDFLAGS=""}
 			: ${LIBPATHENV=DYLD_LIBRARY_PATH}
 			# /usr/local/include is always searched for