Use M_PI* instead of F_PI*

Change-Id: Ie2b7a1c74fc516781a17a20157b8217bc41e383d
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/125504
Tested-by: Jenkins
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>

cppcanvas/source/mtfrenderer/implrenderer.cxx

@@ -768,7 +768,7 @@ namespace cppcanvas::internal
             if( nFontAngle != 0 )
             {
                 // set to unity transform rotated by font angle
-                const double nAngle( nFontAngle * (F_PI / 1800.0) );
+                const double nAngle( nFontAngle * (M_PI / 1800.0) );
                 o_rFontRotation = -nAngle;
             }
             else