Add note on includedir

OBS-URL: https://build.opensuse.org/package/show/X11:Wayland/wayland?expand=0&rev=95

wayland.spec

@@ -151,13 +151,14 @@ sed -i 's/<eglversion>/%eglversion/' "%_sourcedir/baselibs.conf"
 if [ ! -e configure ]; then
 	autoreconf -fi
 fi
+# includedir intentional, cf. bugzilla.opensuse.org/795968
 %configure --disable-static --includedir="%_includedir/%name" \
 %if %with_doc
 	--docdir="%_defaultdocdir/%name"
 %else
 	--disable-documentation
 %endif
-make %{?_smp_mflags}
+%make_build
 
 %install
 %make_install %{?_smp_mflags}