dist: fix embedders autogen by adding standalone-directories to embedded tarball

Embedders don't get utils,tests,contrib/*,doc,... directories in their
tarball because they build hwloc in embedded mode.
However it means their tarballs cannot be re-autogen'ed because automake
fails when those directories are missing
(automake doesn't know if we're in embedded or standalone mode).

OMPI didn't have any issue in the past because they manually copied
hwloc embedded directories AND created standalone subdirectories that
their automake would dist.
Now that they use hwloc as git submodule, bring the proper fix inside hwloc
so that OMPI doesn't have to hardwire that list of subdirectories anymore.

Refs open-mpi/ompi#7363

Note that pure-hwloc embedded tarballs still cannot be re-autogen'ed
because they needs many more standalone files
(e.g. all .in files used by configure) but we do not care.

Signed-off-by: Brice Goglin <[email protected]>
(cherry picked from commit b332c93)

Author: bgoglin

Makefile.am

@@ -71,7 +71,19 @@ endif
 if HWLOC_BUILD_STANDALONE
 dist-hook:
 	sh "$(top_srcdir)/config/distscript.sh" "$(top_srcdir)" "$(distdir)" "$(HWLOC_VERSION)"
-endif HWLOC_BUILD_STANDALONE
+else !HWLOC_BUILD_STANDALONE
+# Create directories needed by embedders' autogen (directories ignored by embedded dist)
+dist-hook:
+	@MKDIR_P@	\
+		$(distdir)/doc \
+		$(distdir)/netloc \
+		$(distdir)/utils \
+		$(distdir)/tests \
+		$(distdir)/contrib/hwloc-ps.www \
+		$(distdir)/contrib/misc \
+		$(distdir)/contrib/systemd \
+		$(distdir)/contrib/windows
+endif !HWLOC_BUILD_STANDALONE
 
 if HWLOC_BUILD_STANDALONE
 if HWLOC_HAVE_WINDOWS