sencha: use xmake -b instead of xmake build
"-b" is almost equivalent to "build"; it also supports specifying targets.
Use it instead to simplify doing c&p from the build log.
Change-Id: Iabc32d53622e434bfcea6b71698f63cbbfd4091b
This is the project containing all the top-level build targets of all the projects within the GoB to set up the environment and build the e2e artifacts.
