mozilla-nspr: obsolete header-nspr; prefer 64 bit; move 32 bit support to separate package

[mtelka]

The library/nspr/header-nspr package currently contains an (incomplete) set of developer files (includes and the nspr-config script). I see no reason to have such files living separately so I merged all files from library/nspr/header-nspr to the main library/nspr package.

Previously, the /usr/bin/nspr-config script was for 32 bit. Now the 64-bit is preferred so the /usr/bin/nspr-config script is for 64 bit while the 32-bit one is in /usr/bin/i86/nspr-config.

Finally, the 32-bit related stuff was split out to new library/nspr/32 package.

[mtelka]

This is blocked by #19221.

[AndWac]

#19221 is already merged

[mtelka]

#19221 is already merged

Thank you. I need to refresh, update (add illumos-gate patch) and re-test this one. Should be done today.

[mtelka]

rebase only

[mtelka]

Added patch for illumos-gate/exception_lists/packaging.deps to make sure the build of the illumos-gate component succeeds. The patch will be upstreamed later together with other similar changes in packaging.deps.