Add share/rpcuser to dist. source code archive

Github-Pull: #11530
Rebased-From: fa81534
Tree-SHA512: 97bc91760a3284a9b60dcde04e789aed3c83539ec6621cb38dbc5bd852bfc0cdcaffceff7ca6de0c64f00149e6774d7dd651520b39876a674f1e82efba98945d

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 \