Make this script more generic and minimize differences between
the openssl and libz versions:
- use a generic ${lib_version}
- define ${version_file} to look run ${version_re} on to
acquire the libr

Make this script more generic and minimize differences between
the openssl and libz versions:
- use a generic ${lib_version}
- define ${version_file} to look run ${version_re} on to
acquire the library version.
- add license
- remove unused -k flag

no change in generated files

ok sthen@

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Add a zlib.pc pkg-config file, based what newer zlibs ship.
tested by landry@ in a bulk.
ok miod@ sthen@