shutils/chroot.sh: propagate XBPS_USE_GIT_REVS to chroot.
shutils/builddep_funcs.sh: use pkgver property to find deps for xbps>=0.21 compat.
Merge branch 'master' of github.com:xtraeme/xbps-src

* 'master' of github.com:xtraeme/xbps-src:
  Fix missing '>' in help message