Don't forcefully pass -gstabs+ to the compiler

This fixes compilation with modern clang on OS X 10.9.
Comment out an unused inline template function that references an undeclared function

This fixes compilation with modern clang on OS X 10.9.
Add a missing include for the free function
Update the gcc-539 patch for building on x86_64 darwin
Avoid using "sed -i", since the syntax differs between OS X and linux
Fix running extract_svgttool on utf-8 locales on OS X
Fix building gcc-539 without -O2 with modern clang on OS X

The -O2 option is stripped out to fix some old issue with building
gcc-539 on x86_64 on linux. This issue can't be reproduced at the
moment, but it's safer to make the code build correctly even without
-O2.
Fix running install_gcc_539 on a directory that already has got the epoc-pe-cpp symlink
Always set a cpp symlink

Newer OS X don't have cpp as a shell script any longer, but it doesn't
work with the options that the old symbian build tools expect.
Fix compilation of csl-gcc with modern clang
Fix the file name of the original SDK package for S60 3.0
Fix compilation of csl-gcc-4.4-172 on modern clang
Fix building csl-gcc 2009q1 with modern clang
Fix building csl-gcc 2011.09-67 on modern OS X with modern clang