RFR: JDK-8294748: Cleanup unneeded references to hg [v2]

[Matthias Baesken]

> There are still a number of unneeded references to hg, for example
> 
> make/autoconf/spec.gmk.in
>  
> 772 HG:=@HG@
>  
> make/autoconf/basic_tools.m4
>  
> 345 UTIL_LOOKUP_PROGS(HG, hg)
> 
> Those can be cleaned up.

Matthias Baesken has updated the pull request incrementally with one additional commit since the last revision:

  remove hg related line from MakeBase.gmk

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/10554/files
  - new: https://git.openjdk.org/jdk/pull/10554/files/d37ade88..8fa4e57a

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=10554&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=10554&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 1 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/10554.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10554/head:pull/10554

PR: https://git.openjdk.org/jdk/pull/10554