[patch] update M4 for INET_NTOP and INET_PTON checks.

[Brad Hards]

libtool: link: gcc -std=gnu99 -g -O2 -o ex-client2 ex-client2.o none required 
none required  ./.libs/libexamples.a ../../lib/.libs/libgnutls.so -
L/usr/local/lib ../../libextra/.libs/libgnutls-extra.so /home/bradh-
dev/gnutls-git/lib/.libs/libgnutls.so -ltasn1 -lz /usr/local/lib/libgcrypt.so 
-lgpg-error ../../gl/.libs/libgnu.a -Wl,-rpath -Wl,/home/bradh-dev/gnutls-
git/lib/.libs -Wl,-rpath -Wl,/home/bradh-dev/gnutls-git/libextra/.libs                     
gcc: none: No such file or directory                                                                              
gcc: required: No such file or directory                                                                          
gcc: none: No such file or directory                                                                              
gcc: required: No such file or directory                                                                          
make[4]: *** [ex-client2] Error 1                                                                                 
make[4]: Leaving directory `/home/bradh-dev/gnutls-git/doc/examples'                                              
make[3]: *** [all-recursive] Error 1                                                                              
make[3]: Leaving directory `/home/bradh-dev/gnutls-git/doc'                                                       
make[2]: *** [all] Error 2                                                                                        
make[2]: Leaving directory `/home/bradh-dev/gnutls-git/doc'                                                       
make[1]: *** [all-recursive] Error 1                                                                              
make[1]: Leaving directory `/home/bradh-dev/gnutls-git'                                                           
make: *** [all] Error 2                                                                                           
makeobj[0]: Leaving directory `/home/bradh-dev/gnutls-git'   

Fix:
diff --git a/gl/m4/inet_ntop.m4 b/gl/m4/inet_ntop.m4                        
index 85a6bb6..ea645f2 100644
--- a/gl/m4/inet_ntop.m4
+++ b/gl/m4/inet_ntop.m4
@@ -18,7 +18,8 @@ AC_DEFUN([gl_INET_NTOP],
     [AC_REPLACE_FUNCS([inet_ntop])])
   LIBS=$gl_save_LIBS
   INET_NTOP_LIB=
-  if test "$ac_cv_search_inet_ntop" != "none needed"; then
+  if test "$ac_cv_search_inet_ntop" != "none needed" &&
+     test "$ac_cv_search_inet_ntop" != "none required"; then
     INET_NTOP_LIB="$ac_cv_search_inet_ntop"
   fi
   AC_SUBST([INET_NTOP_LIB])
diff --git a/gl/m4/inet_pton.m4 b/gl/m4/inet_pton.m4
index f071801..068deee 100644
--- a/gl/m4/inet_pton.m4
+++ b/gl/m4/inet_pton.m4
@@ -18,7 +18,8 @@ AC_DEFUN([gl_INET_PTON],
     [AC_REPLACE_FUNCS([inet_pton])])
   LIBS=$gl_save_LIBS
   INET_PTON_LIB=
-  if test "$ac_cv_search_inet_pton" != "none needed"; then
+  if test "$ac_cv_search_inet_pton" != "none needed" &&
+     test "$ac_cv_search_inet_pton" != "none required"; then
     INET_PTON_LIB="$ac_cv_search_inet_pton"
   fi
   AC_SUBST([INET_PTON_LIB])

Brad