make install fails when GZIP defined in environment

[sambltc]

"env GZIP=-n make install" fails, ending with:

gzip: /bin/gzip.gz: Permission denied
Makefile:151: recipe for target 'install-data' failed
make[1]: *** [install-data] Error 1
Makefile:166: recipe for target 'install-data' failed
make: *** [install-data] Error 1

It seems to be because a variable named "GZIP" is used in the makefiles.
(The existence of GZIP in the environment causes Make to export "GZIP" with it's value (the path to the gzip binary) but gzip itself expects to find command line options in it and fails.)

[michaelrsweet]

Lovely. But also install-sh looks for GZIPPROG and not GZIP, so that too needs to be corrected.

Will change everything to use GZIPPROG (and do the right configure test for its availability...)

[michaelrsweet]

[master 3001a14] Use GZIPPROG instead of GZIP to avoid install issues (Issue #5595)

[branch-2.2 3676fc3] Use GZIPPROG instead of GZIP to avoid install issues (Issue #5595)

[sambltc]

Thanks so much for the fix! :-)