Applied patch [ 632115 ] Fixed internationalization on tooltips

Applied patch [ 632115 ] Fixed internationalization on tooltips

wxMac's wxTooltip assumed that text was always PC encoded,
and always converted the string using
wxMacMakeMacStringFromPC(). This worked fine for English
characters, but multi-byte encoded languages such as Japanese
(SJIS) because garbled. I've added a check for
"wxApp::s_macDefaultEncodingIsPC" before performing the
conversion similar to other controls.

Nilesh Agarwalla

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@18150 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775