Fixes #1693.

Fixes #1692.

Disable strip-unneeded on iOS too

See http://blog.travis-ci.com/2013-05-20-network-timeouts-build-retries/
. Thanks to Mateusz Kowalczyk for the tip.

Fix small documentation error

Fixes #1686.

Added flag to disable generation of package documentation

bootstrap.sh now also builds documentation of installed packages

For compatibility with '~/.cabal/config'.

Hopefully.

bootstrap.sh: document curl TODO

Hackage 2 doesn't support byte ranges at the moment, which makes curl exit with
error if there's an incomplete tarball present. Fixes #1675.

Fix bootstrap.sh

There were three errors in CC detection:

1. The wrong variable was used in the for loop.

2. The selected CC was checked for existence and execute perm,
   but instead of the full path to the executable just the basename
   was passed to test -x.

3. The info log message accidentally printed the value of CC.

check linker, other script fixups

One user reported being rather confused by the message:

  cabal: The program happy version >=1.18.5 is required but it could
  not be found.

I guess they must have been wondering what a happy version was. They
said that this is much clearer:

  cabal: The program 'happy' version >=1.18.5 is required but it could
  not be found.

So that's what we now do.