checksize.pl chokes on empty files created by __debug_install_post…

…that is /usr/lib/rpm/mageia/find-debuginfo.sh on Mageia for example.
As the desktop-integration packages don't have any binaries whose
debuginfo could be extracted and put into a -debug package, there is no
impact on the packages themselves.

Change-Id: I99756f6a1a3de707a94f7559b9f1b5169d2e7ee1
Reviewed-on: https://gerrit.libreoffice.org/630Reviewed-by: Miklos Vajna <vmiklos@suse.cz>
Tested-by: Miklos Vajna <vmiklos@suse.cz>

sysui/desktop/tg_rpm.mk

@@ -42,5 +42,6 @@ $(RPMFLAGFILES) : $(SPECFILE)
         --define "iconprefix $(ICONPREFIX.$(@:b:s/-/ /:1))" \
         --define "version $(PKGVERSION.$(@:b:s/-/ /:1))" \
         --define "release $(PKGREV)" \
+        --define "__debug_install_post %nil" \
         --define "_unpackaged_files_terminate_build  0" && $(TOUCH) $@
 .ENDIF