pgsql: Change HAVE_LIBLZ4 and HAVE_LIBZSTD tests to USE_LZ4 and USE_ZST

Change HAVE_LIBLZ4 and HAVE_LIBZSTD tests to USE_LZ4 and USE_ZSTD.

These tests were added recently, but older code tests USE_LZ4 rathr
than HAVE_LIBLZ4, so let's follow the established precedent. It
also seems more consistent with the intent of the configure tests,
since I think that the USE_* symbols are intended to correspond to
what the user requested, and the HAVE_* symbols to what configure
found while probing.

Discussion: http://postgr.es/m/CA+Tgmoap+hTD2-QNPJLH4tffeFE8MX5+xkbFKMU3FKBy=ZSNKA@mail.gmail.com

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/75eae090876f4d47bf6a1e1016627b75da612307

Modified Files
--------------
src/backend/replication/basebackup_lz4.c      |  8 ++++----
src/backend/replication/basebackup_zstd.c     |  8 ++++----
src/bin/pg_basebackup/bbstreamer_lz4.c        | 12 ++++++------
src/bin/pg_basebackup/bbstreamer_zstd.c       | 12 ++++++------
src/bin/pg_basebackup/pg_receivewal.c         |  6 +++---
src/bin/pg_basebackup/t/020_pg_receivewal.pl  |  2 +-
src/bin/pg_basebackup/walmethods.c            | 20 ++++++++++----------
src/bin/pg_dump/t/002_pg_dump.pl              |  2 +-
src/bin/pg_verifybackup/t/008_untar.pl        |  4 ++--
src/bin/pg_verifybackup/t/009_extract.pl      |  4 ++--
src/bin/pg_verifybackup/t/010_client_untar.pl |  4 ++--
11 files changed, 41 insertions(+), 41 deletions(-)