Enable verification of langpacks checksums

[boklm]

When switching to esr60 we temporarily disabled the checking of langpacks checksums in projects/firefox-langpacks/build because they were missing in the SHA512SUMS files.

It looks like the bug causing this issue will be fixed soon:
​https://bugzilla.mozilla.org/show_bug.cgi?id=1463749

We should enable this check again in the next release where this bug has been fixed.

[boklm]

The fix has been included in the esr60 branch:
​https://bugzilla.mozilla.org/show_bug.cgi?id=1463749#c29
So this should be fixed in 60.2.

[sukhbir]

Review:

​https://github.com/azadi/tor-browser-build-1/tree/bug-27061

Note: this modifies only firefox-langpacks and does not set the firefox_platform_version. Let me know if it should do that as well. (Also this assumes 60.2 for tor-browser since that has the relevant patches but then again, that's not covered in this patch.)

[gk]

Replying to sukhbir:

Review:

​https://github.com/azadi/tor-browser-build-1/tree/bug-27061

Note: this modifies only firefox-langpacks and does not set the firefox_platform_version. Let me know if it should do that as well. (Also this assumes 60.2 for tor-browser since that has the relevant patches but then again, that's not covered in this patch.)

No, that's fine. This looks good to me. I'll apply this while we are switching to 60.2.0esr, thanks.

[gk]

Replying to gk:

Replying to sukhbir:

Review:

​https://github.com/azadi/tor-browser-build-1/tree/bug-27061

Note: this modifies only firefox-langpacks and does not set the firefox_platform_version. Let me know if it should do that as well. (Also this assumes 60.2 for tor-browser since that has the relevant patches but then again, that's not covered in this patch.)

No, that's fine. This looks good to me. I'll apply this while we are switching to 60.2.0esr, thanks.

Done with commit 7a88a4858db7fca96e126eba8fd0d0706bc36516 on master.