cmake: Set /source-charset:utf-8 for MSVC. Otherwise compiler will use system codepage as source character set. * CMakeLists.txt (): Add /source-charset:utf-8 to add_compile_options(). git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1937124 13f79535-47bb-0310-9956-ffa450edef68