configure: Remove CFG_C_COMPILER. Unused
Update skia and rust-azure
Update rust submodule to include fix for rust issue #6117. Fixes #401
Merge remote-tracking branch 'brson/wip'

Conflicts:
	src/rust
submodule: update rust-wapcaplet
Merge pull request #405 from yichoi/pull-0502

submodule: update rust-wapcaplet
submodule: update rust-geom
Merge pull request #407 from yichoi/pull-rust-geom

submodule: update rust-geom
submodule: update rust-opengles
submodule: update sharegl
submodule: update rust-fontconfig
update servo for language change
submodule: update rust-opengles
submodule: update rust-glut
submodule: update rust-css
submodule: update rust-netsurfcss
submodule: update rust-mozjs
Merge pull request #408 from aydinkim/master

update for language changes
submodule: update rust-glut
delete JosefinSans and related works