Add mercury-compiler.spec from Mercury repository.
Update mercury-compiler.spec file.

Expect the user to define VERSION and VERSION_WITH_UNDERSCORES macros.
We are no longer in the Mercury source directory so it cannot be
generated by autoconf @VAR@ substitutions (not that it really made sense).

Copyright field is deprecated; replace by License and specify GPL/LGPL
versions.

Change Group to satisfy rpmlint.

Update URLs and email addresses.  Delete Packager, Vendor fields.

Require bison and flex at build time.

Enable parallel builds.

Add actions to install and uninstall info files to the system
when the package is installed or uninstalled.

Update the list of packaged files.

Don't package INSTALL* files (rpmlint warning).

Don't package *.bat files.

Don't package samples directory.  rpmlint warns about some of the
contents and they are not that important.

Move spec file changelog to end of file.
Add make_rpm script.