Merge branch 'build_cmake' of https://github.com/TcT2k/wxWidgets

Add CMake-based build system.

Merge the original branch without any changes except for resolving the
conflict due to moving the contents of .travis.yml to a separate file by
propagating the changes done in this file since then to the new script
and rerunning ./build/update-setup-h and ./build/cmake/update_files.py
to update the file lists changed in the meanwhile.

Closes https://github.com/wxWidgets/wxWidgets/pull/330

build/update-setup-h

@@ -39,6 +39,11 @@ cat_common_options_for()
         cmd="$cmd | sed -e '/^\/\//d' \
                         -e 's@ *//.*\$@@' \
                         -e 's/# *define \(.\+\) \+1 *\$/#define \1 0/'"
+    elif [ $2 = "build/cmake/setup.h.in" ]; then
+        # The setup.h.in template for cmake needs special processing
+        cmd="$cmd | sed -e '/^\/\//d' \
+                        -e 's@ *//.*\$@@' \
+                        -e 's/# *define \(.\+\) \+\(1\|0\) *\$/#cmakedefine01 \1/'"
     fi
 
     eval $cmd
@@ -103,10 +108,12 @@ update_common_setup_h include/wx/gtk/setup0.h
 update_common_setup_h include/wx/osx/setup0.h
 update_common_setup_h include/wx/univ/setup0.h
 update_common_setup_h setup.h.in
+update_common_setup_h build/cmake/setup.h.in
 
 update_msw_setup_h include/wx/msw/setup0.h
 update_msw_setup_h include/wx/gtk/setup0.h
 update_msw_setup_h setup.h.in
+update_msw_setup_h build/cmake/setup.h.in
 
 update_osx_setup_h include/wx/osx/setup0.h
 update_msw_setup_h setup.h.in