Fix doxygen docs: missing excludes and CMake paths.

This commit fixes two issues:

Doxygen build with CMake needs paths relative to CMake source dir.

Missing excluded files taken from STR #3320, file #42 (by Manolo):
  http://www.fltk.org/strfiles/3320/scaling_rect_r12544.patch


git-svn-id: file:///fltk/svn/fltk/branches/branch-1.4@12545 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

documentation/Doxyfile.in

@@ -614,6 +614,8 @@ RECURSIVE              = YES
 EXCLUDE  = @CMAKE_SOURCE_DIR@/src/drivers/
 EXCLUDE += @CMAKE_SOURCE_DIR@/src/fl_dnd_win32.cxx
 EXCLUDE += @CMAKE_SOURCE_DIR@/src/fl_dnd_x.cxx
+EXCLUDE += @CMAKE_SOURCE_DIR@/src/fl_font_mac.cxx
+EXCLUDE += @CMAKE_SOURCE_DIR@/src/fl_font_win32.cxx
 EXCLUDE += @CMAKE_SOURCE_DIR@/src/Fl_get_key_mac.cxx
 EXCLUDE += @CMAKE_SOURCE_DIR@/src/Fl_get_key_win32.cxx
 
@@ -652,7 +654,8 @@ EXCLUDE_SYMBOLS +=  Fl_Native_File_Chooser_FLTK_Driver
 # directories that contain example code fragments that are included (see
 # the \include command).
 
-EXAMPLE_PATH           = ../test ../examples
+EXAMPLE_PATH           = @CMAKE_CURRENT_SOURCE_DIR@/../test \
+                         @CMAKE_CURRENT_SOURCE_DIR@/../examples
 
 # If the value of the EXAMPLE_PATH tag contains directories, you can use the
 # EXAMPLE_PATTERNS tag to specify one or more wildcard pattern (like *.cpp