Restore build in <= 4.4 tree

Change-Id: I7cdb4df67543192e1777071eea9525c293c0ebd2
Merge remote-tracking branch 'twrp/master'
Look for 'mount(' instead of mount while modifying updater-script

* Fixes support for is_mounted

Change-Id: Ic27dc3f829930964f6a4e842a08cd620b3a73b3b
Try to keep the braces we need while removing lines from updater-script

Change-Id: I57c08b808db3720ffd4ead38dddd0454baee845c
Merge remote-tracking branch 'twrp/master'