Add extern "C" { } block to xsltlocale.h

Make it safe to include this file in C++ sources.

libxslt/xsltlocale.h

@@ -14,6 +14,10 @@
 #include <libxml/xmlstring.h>
 #include "xsltexports.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 XSLTPUBFUN void * XSLTCALL
 	xsltNewLocale			(const xmlChar *langName,
 					 int lowerFirst);
@@ -33,4 +37,8 @@ XSLTPUBFUN int XSLTCALL
 					 const xmlChar *str1,
 					 const xmlChar *str2);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* __XML_XSLTLOCALE_H__ */