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Make call of tool (i.e. the compiler) work when it has spaces in its paths.

Test-suite titivation
		      ---------------------

This commit achieves several glorious goals and adds many frivolous
features:

    * Makes the test driver work on Windows (use bash for system calls)
    * Adds -Di386_unknown_mingw32 to CPP_OPTS so that Win-specific code is
      compiled properly
    * Adds the ability to have platform-specific test results (by setting
      the new $platform variable to config.mk's TARGETPLATFORM)
    * Fixes several tests to work on Windows, mostly by adding platform-
      specific result files.
    * Pipes all stderr files through normalise_errmsg, which itself is
      improved to handle .exe at the end of filenames, and backslashes.
    * Allows stdout output to be piped through normalise_errmsg; useful in
      the rare cases where output includes filenames.
    * Comprehensively breaks the testsuite on all other platforms (with any
      luck)
    * Splundig vur thrig, earthlets!

Expunge more bash-isms.

MERGE TO STABLE

Allow multi-module compile-only tests.

More tidyups and code sharing.

Allow expected failures, by setting the global var $expect to "fail"
(defaults to "pass").

-- Use diff to show diffs between actual and expected compiler output.
-- Show compiler output in cases where none was expected.

Support file for multiple-module tests.

Fix bug in vanilla-comp-test-actions

Improved diagnostics when a should_compile test fails.

More diagnostic wibbles.

Further improvements to printing of diagnostic information.

normalise_errmsg()s in a few more places.

Further adventures to do with approximate matching of compiler error
messages.  Use the new pipe facility in the test driver to normalise
error messages before comparison, by piping them through new program
normalise_errmsg.  This avoids various kinds of tiresome comparison
failures to do with capitalisation, whitespace changes, and path
names.

Add support for compile-only (should_run) style tests.

Track recent hackery.

Commit hackery so far.

Changes to support running "vanilla" tests -- those with a single source
file, reference .stdin, .stdout and maybe .stderr files.  These constitute
the vast majority of GHC tests.