Summary: * Analyze PATH issues for win32 binary toolchain.

Details: 1. Analyze PATH issues for win32 binary toolchain. * gcc can not find the install dir if user set PATH="INSTALL_DIR\bin" in dos cmdline, which leads to compile fail since gcc can not find ../lib, ../libexec, etc. * Root cause: in dos, " is taken as part of dirs during set PATH, which is different from cygwin or linux. And dir with " is invalid in dos. * Work out a patch to filter " in function make_relative_prefix_1 and discuss it with Michael. * Create an windows install package, so users do not need to set PATH. Will discuss more detail with Michael for the following releases. 2. Read document to ramp-up on gcc.

Plans: * Feb 6-10: Linaro Connect Q1.12

Best regards! -Zhenqiang