Get rid of c++ in blenkernel and modifiers

Also use guarded allocations for navmesh stuff.

extern/recastnavigation/recast-capi.cpp

@@ -0,0 +1,37 @@
+/*
+ * $Id$
+ *
+ * ***** BEGIN GPL LICENSE BLOCK *****
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * The Original Code is Copyright (C) 2011 Blender Foundation.
+ * All rights reserved.
+ *
+ * Contributor(s): Sergey Sharybin
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+
+#include "recast-capi.h"
+
+#include <math.h>
+#include "Recast.h"
+
+int recast_buildMeshAdjacency(unsigned short* polys, const int npolys,
+			const int nverts, const int vertsPerPoly)
+{
+	return (int) buildMeshAdjacency(polys, npolys, nverts, vertsPerPoly);
+}