Supress msvc warning.

Replace tabs with spaces.

src/nvcore/Debug.cpp

@@ -174,6 +174,8 @@ namespace
         return i - skip;
     }
 
+#pragma warning(push)
+#pragma warning(disable:4748)
     static NV_NOINLINE int backtrace(void * trace[], int maxcount) {
         CONTEXT ctx = { 0 };
 #if NV_CPU_X86 && !NV_CPU_X86_64
@@ -191,7 +193,7 @@ namespace
 
         return backtraceWithSymbols(&ctx, trace, maxcount, 1);
     }
-
+#pragma warning(pop)
 
     static NV_NOINLINE void printStackTrace(void * trace[], int size, int start=0)
     {

src/nvimage/BlockDXT.cpp

@@ -32,7 +32,7 @@ using namespace nv;
 
 
 /*----------------------------------------------------------------------------
-    BlockDXT1
+BlockDXT1
 ----------------------------------------------------------------------------*/
 
 uint BlockDXT1::evaluatePalette(Color32 color_array[4], bool d3d9/*= false*/) const
@@ -255,7 +255,7 @@ inline void BlockDXT1::flip2()
 
 
 /*----------------------------------------------------------------------------
-    BlockDXT3
+BlockDXT3
 ----------------------------------------------------------------------------*/
 
 void BlockDXT3::decodeBlock(ColorBlock * block, bool d3d9/*= false*/) const
@@ -328,7 +328,7 @@ void BlockDXT3::flip2()
 
 
 /*----------------------------------------------------------------------------
-    BlockDXT5
+BlockDXT5
 ----------------------------------------------------------------------------*/
 
 void AlphaBlockDXT5::evaluatePalette(uint8 alpha[8], bool d3d9) const