Capitalize descriptions of --HEAD, --devel

Closes #35027.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
htop-osx: update 0.8.2.2 bottle.
gtk+3 3.14.6
gtk+3: update 3.14.6 bottle.
google-perftools 2.3

Closes #35035.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
google-perftools: update 2.3 bottle.
Utils.popen_read doesn't doesn't require a block
Use quiet_system to avoid the shell
Use Utils.popen_read to avoid shelling out in a few places
wget: restore build-time dep on XZ for HEAD
dub: remove custom download strategy
salt: remove custom download strategy
l-smash: set GIT_DIR instead of symlinking
libcouchbase: set GIT_DIR instead of symlinking
syncthing: set GIT_DIR instead of symlinking
pulse: set GIT_DIR instead of symlinking
syncthing 0.10.12

Version bump.

Closes #35041.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
syncthing: update 0.10.12 bottle.
Merge remote-tracking branch 'upstream/master'