FIXES:
4553fc5e6cb6 #10082 vim-patch:8.1.1365: :source should check sandbox

OTHER:
877d53990414 #10027 genappimage.sh: migrate to linuxdeploy

Problem:    Source command doesn't check for the sandbox. (Armin Razmjou)
Solution:   Check for the sandbox when sourcing a file.
https://github.com/vim/vim/commit/53575521406739cf20bbe4e384d88e7dca11f040

generate_type2_appimage is unmaintained, and lacks a way to rename the appimage file.

fix #9893

Maintenance release to fix issues found in v0.3.4.

FIXES:

f891131c6bb2 #9894 options: properly reset directories on 'autochdir'
9a5488c2a67e Remove MSVC optimization workaround for SHM_ALL
1793ba81762f Make SHM_ALL to a variable instead of a compound literal #define
947069ba1438 doc: mention "pynvim" module rename
46c7e12f27f1 #9629 screen: don't crash when drawing popupmenu with 'rightleft' option
f1843c003576 vim-patch:8.1.0677: look-behind match may use the wrong line number
120442188872 #8325 :terminal : set topline based on window height
aaa8c3d7112a #9504 :recover : Fix crash on non-existent *.swp

Fixes https://github.com/neovim/neovim/issues/9892

gcc-9 has [improved compliance] with the C spec for lifetime of compound
literals, tying their lifetime to block scope instead of function scope.
This makes the behavior comparable to all other automatic variables.

Using the SHM_ALL #define instantiated a compound literal local to an if
clause and assigned the address to a "char_u *".  Since the pointer was
then being used outside of the if clause, it was using an invalid
address.

[improved compliance]: https://gcc.gnu.org/gcc-9/porting_to.html#complit

Closes #9855

closes #9764