configure: fix vtable help

Spacing is off causing --help to not line up.  Use the standard
AS_HELP_STRING like all the other options.

From-SVN: r223833

ChangeLog

+2015-05-28  Mike Frysinger  <vapier@gentoo.org>
+
+	* configure.ac (--vtable-verify): Use AS_HELP_STRING for help.
+	* configure: Regenerate.
+
 2015-05-26  Jason Merrill  <jason@redhat.com>
 
 	* configure.ac: When bootstrapping with GCC, add -std=c++98 to CXX.

configure

@@ -1500,7 +1500,7 @@ Optional Features:
                           Mostly useful for compiler development
   --enable-objc-gc        enable use of Boehm's garbage collector with the GNU
                           Objective-C runtime
-  --enable-vtable-verify    Enable vtable verification feature
+  --enable-vtable-verify  Enable vtable verification feature
   --enable-serial-[{host,target,build}-]configure
                           force sequential configuration of sub-packages for
                           the host, target or build machine, or all

configure.ac

@@ -2677,7 +2677,8 @@ AC_SUBST(BUILD_CONFIG)
 # Use same top-level configure hooks in libgcc/libstdc++/libvtv.
 AC_MSG_CHECKING([for --enable-vtable-verify])
 AC_ARG_ENABLE(vtable-verify,
-[  --enable-vtable-verify    Enable vtable verification feature ],
+[AS_HELP_STRING([--enable-vtable-verify],
+		[Enable vtable verification feature])],
 [case "$enableval" in
  yes) enable_vtable_verify=yes ;;
  no)  enable_vtable_verify=no ;;