fixups for recent "Cleanup jenkins build scripts"

Change I24e500e132f5c8e8133d35548cb7b4e4552331d0 was merged, but IMHO needs
improvement. Fix these:

- clean the git source tree before each build step, in common prep_build().
- fix indenting inside the build() macros.
- change build() arg to be build_dir, to absorb cleanup steps into build().
- in jenkins.sh, use $ENABLE_SANITIZE as global env, not passed as arg.
- in jenkins.sh, don't do 'make distcheck' twice. It is not necessary to do it
  from source tree as well as separately from source tree, since distcheck
  already moves to a different build dir.

Change-Id: I09d306350602f21943d5bd45f7388c83ede9b524

0 files changed, 0 insertions, 0 deletions