FIxes to cabal wrapper script.

The new --with-strip=... option is to prevent linking errors of the form
"Unsupported ELF machine number 0". These errors did not occur when building
and installing with cabal-install but, rather, later when linking an executable
or library that depended on the library that had been installed.
Merge pull request #1 from sseefried/stable-ghc-snapshot

Fixes to cabal wrapper script.