Merge #11530: Add share/rpcuser to dist. source code archive

fa81534 Add share/rpcuser to dist. source code archive (MarcoFalke)

Pull request description:

  As the legacy rpcuser and rpcpassword are deprected since 0.12.0, we should actually include the script to generate the new auth pair in the distributed source code archive.

  Ref: #6753

  (Tagging for backport, since it is a trivial bugfix)

Tree-SHA512: f2737957a92396444573f41071a785be5fb318df9efeb3ade7e56b3b56d512e5f9ca36723365fe5be8aaee69c5e8d8ed1178510bf02186c848b3910ee001ecb9

Makefile.am

@@ -44,6 +44,9 @@ DIST_CONTRIB = $(top_srcdir)/contrib/bitcoin-cli.bash-completion \
 	       $(top_srcdir)/contrib/bitcoind.bash-completion \
 	       $(top_srcdir)/contrib/init \
 	       $(top_srcdir)/contrib/rpm
+DIST_SHARE = \
+  $(top_srcdir)/share/genbuild.sh \
+  $(top_srcdir)/share/rpcuser
 
 BIN_CHECKS=$(top_srcdir)/contrib/devtools/symbol-check.py \
            $(top_srcdir)/contrib/devtools/security-check.py
@@ -213,7 +216,7 @@ endif
 
 dist_noinst_SCRIPTS = autogen.sh
 
-EXTRA_DIST = $(top_srcdir)/share/genbuild.sh test/functional/test_runner.py test/functional $(DIST_CONTRIB) $(DIST_DOCS) $(WINDOWS_PACKAGING) $(OSX_PACKAGING) $(BIN_CHECKS)
+EXTRA_DIST = $(DIST_SHARE) test/functional/test_runner.py test/functional $(DIST_CONTRIB) $(DIST_DOCS) $(WINDOWS_PACKAGING) $(OSX_PACKAGING) $(BIN_CHECKS)
 
 EXTRA_DIST += \
     test/util/bitcoin-util-test.py \