Cocoa: Fixes for pattern brush to be Windows widgetset and Delphi compatible.

Original Reporter info from Mantis: Yury

• Reporter name: Yuriy Sydorov

Description:

Attached patch resolves the following:
- Properly draw custom monochrome brush patterns. The current brush color is used to paint the pattern's background, the current text color is used to paint the pattern's foreground.
- Fixed pattern alignment.

Steps to reproduce:

Attached the patch, a demo project, screenshots of the demo project to demonstrate the same brush drawing after the patch on Mac and Windows.

Mantis conversion info:

• Mantis ID: 36565
• Version: 2.1 (SVN)
• Fixed in revision: 62539 (#f588bfbd)