[Cygwin] Abandon Cygwin-1.5 and g++-3. Use g++-4.3 and higher on Cygwin-1.7.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@148636 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed