Avoid bash-ism in Makefile

BUG=none
TBR=machenbach@chromium.org
LOG=n

Review URL: https://codereview.chromium.org/412503002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22528 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Add landmines support.

The scripts are copied from chromium/src/build and simplified.

BUG=
R=jkummerow@chromium.org, jochen@chromium.org

Review URL: https://codereview.chromium.org/405373005

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22529 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Landmine after ICU52 roll.

BUG=
TBR=jochen@chromium.org

Review URL: https://codereview.chromium.org/412513002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22530 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Merge remote-tracking branch 'upstream/master'