Revert "meta/site/common: Globally disable rpath option for all gettext packages"

This reverts commit da9f079481ed65d541cf5b95b47b3b1db6d79c5e which turned out to
cause more problem that it fixed with libtool failures of:

| i586-poky-linux-libtool: link: unsupported hardcode properties
| i586-poky-linux-libtool: link: See the libtool documentation for more information.
| i586-poky-linux-libtool: link: Fatal configuration error.

as the hardcoded test result breaks libtool internal assumptions about linking on
Linux.

meta/site/common

@@ -7,6 +7,3 @@ ac_cv_file__dev_random=${ac_cv_file__dev_random=yes}
 # Avoid sudo to assume void for unsetenv in cross environment, or else it conflicts with
 # target stdlib.h prototype which follows POSIX compiliance. Mark for upstream.
 sudo_cv_func_unsetenv_void=no
-
-# Whether gettext macros should add rpath options
-acl_cv_rpath=${acl_cv_rpath=no}