* acinclude.m4 (GLIBCXX_ENABLE): Properly quote argument to
AC_HELP_STRING.  Double quote expansion of _g_help.
(GLIBCXX_ENABLE_LIBSTDCXX_TIME): Double quote third argument of
GLIBCXX_ENABLE.
(GLIBCXX_ENABLE_CHEADERS): Likewise.
(GLIBCXX_ENABLE_CLOCALE): Likewise.
(GLIBCXX_ENABLE_ALLOCATOR): Likewise.
(GLIBCXX_ENABLE_CSTDIO): Likewise.
(GLIBCXX_ENABLE_SYMVERS): Likewise.
* configure: Regenerate.

From-SVN: r164927