Reduce compiler.h to almost nothing (but it's worth keeping around I think, for

the MSVC and MipsPro warning stuff).

As a result of this patch, simgear/sg_traits.h can be deleted. So can SGCMath.h,
but I'll do that separately.

There is one more 'mechanical' change to come - getting rid of SG_USING_STD(X),
but I want to keep that separate from everything else. (There's another mechnica
l change, replacing <math.h> with <cmath> and so on *everywhere*, but one step a
t a time)

simgear/math/SGCMath.hxx

@@ -20,12 +20,6 @@
 
 #include <simgear/compiler.h>
 
-#ifdef SG_HAVE_STD_INCLUDES
-// We have cmath from the standard c++ lib available
 #include <cmath>
-#else
-// We only have math.h with the c89 double functions.
-#include <math.h>
-#endif
 
 #endif

simgear/math/SGMath.hxx

@@ -22,8 +22,9 @@
 
 #include <iosfwd>
 // FIXME, make it compile on IRIX
-#include <osg/GL>
-#undef GLUT_APIENTRY_DEFINED // GL/glut.h undef APIENTRY when this symbol is defined. osg/GL defines it (?).
+
+//#include <osg/GL>
+//#undef GLUT_APIENTRY_DEFINED // GL/glut.h undef APIENTRY when this symbol is defined. osg/GL defines it (?).
                              // This probably would work if we didn't use plib/pu.h that include GL/glut.h 
                              //  on its side.
 

simgear/math/interpolater.cxx

@@ -25,7 +25,7 @@
 
 #include <simgear/compiler.h>
 
-#include STL_STRING
+#include <string>
 
 #include <simgear/debug/logstream.hxx>
 #include <simgear/misc/sgstream.hxx>

simgear/math/interpolater.hxx

@@ -39,7 +39,7 @@
 
 #include <map>
 
-#include STL_STRING
+#include <string>
 SG_USING_STD(string);
 
 class SGPropertyNode;

simgear/math/sg_types.hxx

@@ -35,7 +35,7 @@
 
 #include <simgear/compiler.h>
 
-#include STL_STRING
+#include <string>
 #include <vector>
 
 #include <simgear/math/point3d.hxx>