make rawSystemIOWithEnv close its handles
Look up location of 'ld' etc. in the 'gcc --info' output.

See #1528.
Remove specific username from Makefile
Default Makefile SSH-USER to USER
Rename SSH-USER to SSH_USER for consistency
Merge pull request #1543 from 23Skidoo/ld-ghc-info

Look up location of 'ld' etc. in the 'gcc --info' output.
Merge branch 'master' of github.com:haskell/cabal
Merge branch 'master' of https://github.com/luite/cabal
Exception-safety fixes for 'syncProcess'.