build: include share/rpcauth in tarball & installer

Fixes #19081.

contrib/guix/libexec/build.sh

@@ -369,6 +369,8 @@ mkdir -p "$DISTSRC"
         # has not been run before buildling, this file will be a stub
         cp "${DISTSRC}/share/examples/bitcoin.conf" "${DISTNAME}/"
 
+        cp -r "${DISTSRC}/share/rpcauth" "${DISTNAME}/share/"
+
         # Finally, deterministically produce {non-,}debug binary tarballs ready
         # for release
         case "$HOST" in

share/setup.nsi.in

@@ -75,6 +75,8 @@ Section -Main SEC0000
     File @abs_top_builddir@/release/@BITCOIN_GUI_NAME@@EXEEXT@
     File /oname=COPYING.txt @abs_top_srcdir@/COPYING
     File /oname=readme.txt @abs_top_srcdir@/doc/README_windows.txt
+    SetOutPath $INSTDIR\share\rpcauth
+    File @abs_top_srcdir@/share/rpcauth/*.*
     SetOutPath $INSTDIR\daemon
     File @abs_top_builddir@/release/@BITCOIN_DAEMON_NAME@@EXEEXT@
     File @abs_top_builddir@/release/@BITCOIN_CLI_NAME@@EXEEXT@
@@ -127,6 +129,7 @@ Section /o -un.Main UNSEC0000
     Delete /REBOOTOK $INSTDIR\@BITCOIN_GUI_NAME@@EXEEXT@
     Delete /REBOOTOK $INSTDIR\COPYING.txt
     Delete /REBOOTOK $INSTDIR\readme.txt
+    RMDir /r /REBOOTOK $INSTDIR\share
     RMDir /r /REBOOTOK $INSTDIR\daemon
     DeleteRegValue HKCU "${REGKEY}\Components" Main
 SectionEnd