Modified the `make/scripts/update_copyright_year.sh` script to support Git as well as Mercurial, as per [JDK-8279315](https://bugs.openjdk.java.net/browse/JDK-8279315). Also added the ability to specify company name as a command line argument instead of being hard-coded into the script.
------------- Commit messages: - 8279315: Add Git support to update_copyright_year.sh script Changes: https://git.openjdk.java.net/jdk/pull/7027/files Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7027&range=00 Issue: https://bugs.openjdk.java.net/browse/JDK-8279315 Stats: 56 lines in 1 file changed: 37 ins; 4 del; 15 mod Patch: https://git.openjdk.java.net/jdk/pull/7027.diff Fetch: git fetch https://git.openjdk.java.net/jdk pull/7027/head:pull/7027 PR: https://git.openjdk.java.net/jdk/pull/7027
