[jdk13u-dev] RFR: 8065704: Set LC_ALL=C for all relevant commands in the build system

[Olga Mikhaltsova]

I'd like to backport JDK-8065704 to jdk13u. 
I observed warnings related to the locale settings during the build on linux aarch64. After applying this patch their numbers reduced. 
The original patch applied cleanly. 
All regular tests passed.

-------------

Commit messages:
 - Backport 54a3efc82980456fc6d8b00cfcb4aa4c786793be

Changes: https://git.openjdk.java.net/jdk13u-dev/pull/309/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk13u-dev&pr=309&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8065704
  Stats: 32 lines in 8 files changed: 12 ins; 0 del; 20 mod
  Patch: https://git.openjdk.java.net/jdk13u-dev/pull/309.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk13u-dev pull/309/head:pull/309

PR: https://git.openjdk.java.net/jdk13u-dev/pull/309