Fix detection of bind_textdomain_codeset in libintl

In Python-2.7, we were only searching for bind_textdomain_codeset in
libc.  We should have also checked for it in libintl.  This change from
Mel Flynn https://bugs.python.org/file24918/python27-configure.in.patch
fixes that.

Fixes: https://bugs.python.org/issue14353

Author: abadger

Misc/NEWS.d/next/Build/2019-05-12-10-52-37.bpo-14353.LK1qWM.rst

@@ -0,0 +1,2 @@
+Fix detection of the bind_textdomain_codeset function for building gettext
+support into the locale module.

configure.ac

@@ -2440,6 +2440,9 @@ fi
 AC_CHECK_LIB(intl, textdomain,
 	AC_DEFINE(WITH_LIBINTL, 1,
 	[Define to 1 if libintl is needed for locale functions.]))
+AC_SEARCH_LIBS(bind_textdomain_codeset, intl,
+	AC_DEFINE(HAVE_BIND_TEXTDOMAIN_CODESET, 1,
+	[Define to 1 if bind_textdomain_codeset is available.]))
 
 # checks for system dependent C++ extensions support
 case "$ac_sys_system" in
@@ -3117,7 +3120,7 @@ fi
 AC_MSG_RESULT(MACHDEP_OBJS)
 
 # checks for library functions
-AC_CHECK_FUNCS(alarm setitimer getitimer bind_textdomain_codeset chown \
+AC_CHECK_FUNCS(alarm setitimer getitimer chown \
  clock confstr ctermid execv fchmod fchown fork fpathconf ftime ftruncate \
  gai_strerror getgroups getlogin getloadavg getpeername getpgid getpid \
  getentropy \