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/cmake/modules/FindWebkit.cmake

@@ -0,0 +1,38 @@
+# - Find Webkit-3.0
+# Find the Webkit-3.0 includes and library
+#
+#  WEBKIT_INCLUDE_DIR - Where to find webkit include sub-directory.
+#  WEBKIT_LIBRARIES   - List of libraries when using Webkit-3.0.
+#  WEBKIT_FOUND       - True if Webkit-3.0 found.
+
+SET( WEBKIT_VERSION "1.0")
+
+IF (WEBKIT_INCLUDE_DIR)
+    # Already in cache, be silent.
+    SET(WEBKIT_FIND_QUIETLY TRUE)
+ENDIF (WEBKIT_INCLUDE_DIR)
+
+FIND_PATH(WEBKIT_INCLUDE_DIR webkit/webkit.h
+    PATH_SUFFIXES "webkitgtk-${WEBKIT_VERSION}"
+)
+
+SET(WEBKIT_NAMES "webkitgtk-${WEBKIT_VERSION}")
+FIND_LIBRARY(WEBKIT_LIBRARY
+    NAMES ${WEBKIT_NAMES}
+)
+
+# Handle the QUIETLY and REQUIRED arguments and set WEBKIT_FOUND to
+# TRUE if all listed variables are TRUE.
+INCLUDE(FindPackageHandleStandardArgs)
+FIND_PACKAGE_HANDLE_STANDARD_ARGS(
+    WEBKIT DEFAULT_MSG
+    WEBKIT_LIBRARY WEBKIT_INCLUDE_DIR
+)
+
+IF(WEBKIT_FOUND)
+    SET( WEBKIT_LIBRARIES ${WEBKIT_LIBRARY} )
+ELSE(WEBKIT_FOUND)
+    SET( WEBKIT_LIBRARIES )
+ENDIF(WEBKIT_FOUND)
+
+MARK_AS_ADVANCED( WEBKIT_LIBRARY WEBKIT_INCLUDE_DIR )