kernel.spec: allow to package some binaries as unstripped

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2161464
Upstream Status: RHEL only
ARK commit 9cc9fe68f41bf0ca97ad7235f4735dc7a22943fc

Some binaries (tests) don't work properly without symbols.
Add a macro that allows to package their unstripped version.

Signed-off-by: Jan Stancek <jstancek@redhat.com>

redhat/kernel.spec.template

@@ -29,6 +29,18 @@
 %global _with_cross    1
 %endif
 
+# RPM macros strip everything in BUILDROOT, either with __strip
+# or find-debuginfo.sh. Make use of __spec_install_post override
+# and save/restore binaries we want to package as unstripped.
+%define buildroot_unstripped %{_builddir}/root_unstripped
+%define buildroot_save_unstripped() \
+(cd %{buildroot}; cp -rav --parents -t %{buildroot_unstripped}/ %1 || true) \
+%{nil}
+%define __restore_unstripped_root_post \
+    echo "Restoring unstripped artefacts %{buildroot_unstripped} -> %{buildroot}" \
+    cp -rav %{buildroot_unstripped}/. %{buildroot}/ \
+%{nil}
+
 # The kernel's %%install section is special
 # Normally the %%install section starts by cleaning up the BUILD_ROOT
 # like so:
@@ -1597,6 +1609,9 @@ cd ..
 ###
 %build
 
+rm -rf %{buildroot_unstripped} || true
+mkdir -p %{buildroot_unstripped}
+
 %if %{with_sparse}
 %define sparse_mflags	C=1
 %endif
@@ -2491,6 +2506,7 @@ find Documentation -type d | xargs chmod u+w
   %{__arch_install_post}\
   %{__os_install_post}\
   %{__remove_unwanted_dbginfo_install_post}\
+  %{__restore_unstripped_root_post}\
   %{__modsign_install_post}
 
 ###