Add GConf2 dependency in rpm spec template

[xadhoom]

Fixes #16015

[mention-bot]

@xadhoom, thanks for your PR! By analyzing the history of the files in this pull request, we identified @Tyriar, @polygotdev and @astitcher to be potential reviewers.

[msftclas]

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[Tyriar]

Thanks for the PR! Will this work for both 32 and 64 bit across most distributions? We had some issues with libXss.so.1 where installation failed because the package was not found in the local package manager..

[xadhoom]

Yes, because I'm mentioning a package name and not a library name.
When you mention a package name, if you omit the arch, the current system arch will be used.
(is also possible to force the arch on a package dep but I'm not doing it on purpose).

[Tyriar]

The problem with libXss though was that the package name differed depending on the OS, some were libXss, some were libXScrnSaver I believe.

[Tyriar]

I think we actually want to do what we do for libXss.so.1 here and have a separate one for 64-bit and 32-bit:

libgconf-2.so.4

libgconf-2.so.4()(64bit)

Chromium seems to do it this way in https://cs.chromium.org/chromium/src/chrome/installer/linux/rpm/expected_deps_x86_64?dr=C&sq=package:chromium

[Tyriar]

I'll follow up with this, thanks for the contribution 😄