- fix build where mhash.h is not declaring

mhash_get_hash_name_static and/or
  mhash_get_keygen_name_static protos

ext/mhash/config.m4

@@ -13,6 +13,20 @@ if test "$PHP_MHASH" != "no"; then
   if test -z "$MHASH_DIR"; then
     AC_MSG_ERROR(Please reinstall libmhash - I cannot find mhash.h)
   fi
+  
+  PHP_MHASH_MISSING_PROTOS=
+  AC_MSG_CHECKING(for missing protos)
+  AC_EGREP_HEADER(mhash_get_hash_name_static, [$MHASH_DIR/include/mhash.h], [
+    AC_DEFINE([HAVE_MHASH_GET_HASH_NAME_STATIC_PROTO], 1, [ ])
+  ], [
+    PHP_MHASH_MISSING_PROTOS="mhash_get_hash_name_static"
+  ])
+  AC_EGREP_HEADER(mhash_get_keygen_name_static, [$MHASH_DIR/include/mhash.h], [
+    AC_DEFINE([HAVE_MHASH_GET_KEYGEN_NAME_STATIC_PROTO], 1, [ ])
+  ], [
+    PHP_MHASH_MISSING_PROTOS="mhash_get_keygen_name_static $PHP_MHASH_MISSING_PROTOS"
+  ])
+  AC_MSG_RESULT([$PHP_MHASH_MISSING_PROTOS])
 
   PHP_ADD_INCLUDE($MHASH_DIR/include)
   PHP_ADD_LIBRARY_WITH_PATH(mhash, $MHASH_DIR/$PHP_LIBDIR, MHASH_SHARED_LIBADD)

ext/mhash/mhash.c

@@ -65,8 +65,12 @@ ZEND_GET_MODULE(mhash)
 
 #define NO_ARGS() (SUCCESS == zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, ""))
 
+#ifndef HAVE_MHASH_GET_HASH_NAME_STATIC_PROTO
 extern const char *mhash_get_hash_name_static(hashid hash);
+#endif
+#ifndef HAVE_MHASH_GET_KEYGEN_NAME_STATIC_PROTO
 extern const char *mhash_get_keygen_name_static(hashid type);
+#endif
 
 /* {{{ int php_mhash */
 int php_mhash(hashid hash, const char *input_str, int input_len, const char *key_str, int key_len, char **enc, int *len TSRMLS_DC)