New version for mipsel

Backport new version to p9 branch.

New version (78.12.0).
Security fixes:
2021-29970 Use-after-free in accessibility features of a document
2021-30547 Out of bounds write in ANGLE
2021-29976 Memory safety bugs fixed in Firefox 90 and Firefox ESR 78.12

Backport new version to p9 branch.

New version (78.11.0).
Security fixes:
2021-29964 Out of bounds-read when parsing a `WM_COPYDATA` message
2021-29967 Memory safety bugs fixed in Firefox 89 and Firefox ESR 78.11

Backport new version to p9 branch.

New version (78.10.1).
Security fixes:
2021-29951 Mozilla Maintenance Service could have been started or stopped by domain users

Backport new version to p9 branch.

New version (78.10.0).
Security fixes:
2021-23994 Out of bound write due to lazy initialization
2021-23995 Use-after-free in Responsive Design Mode
2021-23998 Secure Lock icon could have been spoofed
2021-23961 More internal network hosts could have been probed by a malicious webpage
2021-23999 Blob URLs may have been granted additional privileges
2021-24002 Arbitrary FTP command execution on FTP servers using an encoded URL
2021-29945 Incorrect size computation in WebAssembly JIT could lead to null-reads
2021-29946 Port blocking could be bypassed

Backport new version to p9 branch.
Build for ppc64le.

New version (78.9.0).
Security fixes:
2021-23981 Texture upload into an unbound backing buffer resulted in an out-of-bound read
2021-23982 Internal network hosts could have been probed by a malicious webpage
2021-23984 Malicious extensions could have spoofed popup information
2021-23987 Memory safety bugs fixed in Firefox 87 and Firefox ESR 78.9
Do not build for ppc64le.

Backport new version to p9 branch.

New version (78.8.0).
Security fixes:
2021-23969 Content Security Policy violation report could have contained the destination of a redirect
2021-23968 Content Security Policy violation report could have contained the destination of a redirect
2021-23973 MediaError message property could have leaked information about cross-origin resources
2021-23978 Memory safety bugs fixed in Firefox 86 and Firefox ESR 78.8

Rebuild with llvm11.0.

Backport new version to p9 branch.

New version (78.7.1).
Security fixes:
2021-0001: Buffer overflow in depth pitch calculations for compressed textures