fix crash on startup under windows by avoiding the call

fix crash on startup under windows by avoiding the call

setlocale(LC_MESSAGES, ...

scons tests on LC_MESSAGES there is also an m4 file for LC_MESSAGES
so I think all build systems handle HAVE_LC_MESSAGES.

Index: src/messages.C
===================================================================
--- src/messages.C      (revision 14066)
+++ src/messages.C      (working copy)
@@ -90,7 +90,10 @@
                : lang_(l)
        {
                if ( lang_.empty() ) {
-                       char const * lc_msgs = setlocale(LC_MESSAGES, NULL);
+                       char const * lc_msgs = 0;
+#ifdef HAVE_LC_MESSAGES
+                       lc_msgs = setlocale(LC_MESSAGES, NULL);
+#endif
                        lang_ = lc_msgs ? lc_msgs : "";
                }
                // strip off any encoding suffix, i.e., assume 8-bit po files
@@ -117,8 +120,9 @@
                                        lang = "C";
                        }
                }
-
+#ifdef HAVE_LC_MESSAGES
                char const * lc_msgs = setlocale(LC_MESSAGES, lang_.c_str());
+#endif
                // setlocale fails (returns NULL) if the corresponding locale
                // is not installed.
                // On windows (mingw) it always returns NULL.
@@ -164,7 +168,9 @@
                boost::smatch sub;
                if (regex_match(translated, sub, reg))
                        translated = sub.str(1);
+#ifdef HAVE_LC_MESSAGES
                setlocale(LC_MESSAGES, lang.c_str());
+#endif
                setlocale(LC_CTYPE, oldCTYPE.c_str());
                return translated;
        }

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@14067 a592a061-630c-0410-9148-cb99ea01b6c8