This commit fixes a CMake issue if CMake is invoked from a desktop icon
or the Windows menu, i.e. not within the correct environment to find all
required header files.
We recommend to run CMake from a "Developer Command Prompt for Visual Studio X",
but sometimes users click on their desktop icon and run CMake without the
correct context. In this case some header files in the Windows SDK's are not
found by CMake.
The solution is to issue a warning and "fix" the header detection by faking
that the headers were found, because they are always available in Visual
Studio. The affected headers <locale.h> and <GL/glu.h> were set to "found"
in the bundles IDE's in FLTK 1.3 as well, so there should be no issue with
this fix.
It is also recommended by the CMake folks, i.e. they suggest not to search
for these special header files that are known to exist always.
git-svn-id: file:///fltk/svn/fltk/branches/branch-1.4@12209 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
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