LOADER X11: enable compilation via C++ (#368)

Author: 0-8-15

loaders/x11/x11_microgl.c

@@ -35,6 +35,13 @@ CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
+#ifdef __cplusplus
+extern "C" {
+#if 0
+} // keep emacs indent happy
+#endif
+#endif
+
 // simple X11 loader
 #include <stdio.h>
 #include <stdlib.h>
@@ -516,4 +523,8 @@ void microgl_getCopiedString(char** str) {
   *str = copiedString;
 }
 
+#ifdef __cplusplus
+}
+#endif
+
 // eof