Mac: small updates to the patches:
- Update "osx_gl_hw_accel.patch" to have the full path to the glcanvas.mm to patch, because there are multiple files with that name
- Delete "Drag and Drop.diff" as it is already applied in wxWidgets 2.9.5.
Mac/Build.txt: specify --without-liblzma to wxWidgets configure to avoid an error while building wxWidgets 2.9.5: " ../src/tiff/libtiff/tif_lzma.c:39:10: fatal error: 'lzma.h' file not found"
Merge pull request #933 from ericwa/mac-build-updates

Mac build instruction updates