Evas filters: Buffer names are case-sensitive

Or so claims the documentation, so let's use strcmp
instead of strcasecmp.

src/lib/evas/filters/evas_filter_parser.c

@@ -852,7 +852,7 @@ _buffer_get(Evas_Filter_Program *pgm, const char *name)
    EINA_SAFETY_ON_NULL_RETURN_VAL(name, NULL);
 
    EINA_INLIST_FOREACH(pgm->buffers, buf)
-     if (!strcasecmp(buf->name, name))
+     if (!strcmp(buf->name, name))
        return buf;
 
    // Auto proxies