Draft: Bug 32355: Tor Browser for Linux/ARMv7 (x86_64 build arch)

This is replacing !390 (closed), with the following changes:

• rebased on master
• removed commits already merged
• removed Disable cgo commits, since we will do this differently (!390 (comment 2771604) and following comments)
• squashed some related commits

Closes #32355

/cc @JeremyRand