Replace EXTRA_DIST with dist_noinst_DATA

The EXTRA_DIST variable is ignored when used in the FALSE conditional
of a Makefile.am.  This results in the `make dist` target omitting
these files from the generated tarball unless CONFIG_USER is defined.
This issue can be avoided by switching to use the dist_noinst_DATA
variable which is handled as expected by autoconf.

This change also adds support for --with-config=dist as an alias
for --with-config=srpm and updates the GitHub workflows to use it.

Reviewed-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #13459
Closes #13505

config/Substfiles.am

@@ -41,6 +41,6 @@ endef
 
 SUBSTFILES =
 CLEANFILES += $(SUBSTFILES)
-EXTRA_DIST += $(SUBSTFILES:=.in)
+dist_noinst_DATA += $(SUBSTFILES:=.in)
 
 $(call SUBST,%,)

config/zfs-build.m4

@@ -268,6 +268,7 @@ AC_DEFUN([ZFS_AC_CONFIG], [
 		user)	ZFS_AC_CONFIG_USER   ;;
 		all)    ZFS_AC_CONFIG_USER
 			ZFS_AC_CONFIG_KERNEL ;;
+		dist)                        ;;
 		srpm)                        ;;
 		*)
 		AC_MSG_RESULT([Error!])