math.h for VS2010 version

[Tatsuro MATSUOKA]

Hello

I found that math.h in <octave install dir>/include was required modified when 
VC is not installed in c:/Program Files/Microsoft Visual Studio 10.0/VC.

Line 74 <octave install dir>/include/math.h

#include <c:/Program Files/Microsoft Visual Studio 10.0/VC/include/math.h>

For example, typical install directory for win 7 64 bit, the location of VC++ 
original math.h  is 
c:/Program Files (x86)/Microsoft Visual Studio 10.0/VC/include/math.h

So I modified Line 74 <octave install dir>/include/math.h as,

#include <c:/Program Files (x86)/Microsoft Visual Studio 10.0/VC/include/math.h>

This is a just record.

Tatsuro