Compile fixes to compile LL_DEBUG, and missing header (for linux?)

indra/llcommon/llmemory.h

@@ -35,6 +35,7 @@
 
 #include <new>
 #include <cstdlib>
+#include <stdint.h>		// uintptr_t
 
 #include "llerror.h"
 

indra/newview/llspatialpartition.cpp

@@ -119,7 +119,11 @@ void sg_assert(BOOL expr)
 void validate_drawable(LLDrawable* drawablep)
 {
 	F64 rad = drawablep->getBinRadius();
-	const LLVector3* ext = drawablep->getSpatialExtents();
+	LLVector4a const* exta = drawablep->getSpatialExtents();
+
+	LLVector3 ext[2];
+	ext[0].set(exta[0].getF32ptr());
+	ext[1].set(exta[1].getF32ptr());
 
 	if (rad < 0 || rad > 4096 ||
 		(ext[1]-ext[0]).magVec() > 4096)