libselinux: Fix parallel build with swig python

Commit 966855d added selinux.py as a requirement for pywrap.
This file is generated during the swig step but there is no explicit
rule in the Makefile so parallel build fails. This adds another rule
so the ordering is correct.

jason@meriadoc ~/code/gentoo/selinux/libselinux $ make -j3 pywrap
.... SNIP ....
sed -e 's/@Version@/2.4/; s:@Prefix@:/usr:; s:@libdir@:lib:; s:@includedir@:/usr/include:' < libselinux.pc.in > libselinux.pc
bash exception.sh > selinuxswig_python_exception.i
make[1]: *** No rule to make target 'selinux.py', needed by 'pywrap'.  Stop.
make[1]: *** Waiting for unfinished jobs....
make[1]: Leaving directory '/home/jason/code/gentoo/selinux/libselinux/src'
Makefile:36: recipe for target 'pywrap' failed
make: *** [pywrap] Error 2

Signed-off-by: Jason Zaman <[email protected]>

libselinux/src/Makefile

@@ -29,11 +29,12 @@ LIBPC=libselinux.pc
 SWIGIF= selinuxswig_python.i selinuxswig_python_exception.i
 SWIGRUBYIF= selinuxswig_ruby.i
 SWIGCOUT= selinuxswig_wrap.c
+SWIGPYOUT= selinux.py
 SWIGRUBYCOUT= selinuxswig_ruby_wrap.c
 SWIGLOBJ:= $(patsubst %.c,$(PYPREFIX)%.lo,$(SWIGCOUT))
 SWIGRUBYLOBJ:= $(patsubst %.c,%.lo,$(SWIGRUBYCOUT)) 
 SWIGSO=$(PYPREFIX)_selinux.so
-SWIGFILES=$(SWIGSO) selinux.py
+SWIGFILES=$(SWIGSO) $(SWIGPYOUT)
 SWIGRUBYSO=$(RUBYPREFIX)_selinux.so
 LIBSO=$(TARGET).$(LIBVERSION)
 AUDIT2WHYLOBJ=$(PYPREFIX)audit2why.lo
@@ -135,6 +136,8 @@ $(AUDIT2WHYSO): $(AUDIT2WHYLOBJ)
 $(SWIGCOUT): $(SWIGIF)
 	$(SWIG) $<
 
+$(SWIGPYOUT): $(SWIGCOUT)
+
 $(SWIGRUBYCOUT): $(SWIGRUBYIF)
 	$(SWIGRUBY) $<
 
@@ -154,7 +157,7 @@ install-pywrap: pywrap
 	test -d $(PYLIBDIR)/site-packages/selinux || install -m 755 -d $(PYLIBDIR)/site-packages/selinux
 	install -m 755 $(SWIGSO) $(PYLIBDIR)/site-packages/selinux/_selinux.so
 	install -m 755 $(AUDIT2WHYSO) $(PYLIBDIR)/site-packages/selinux/audit2why.so
-	install -m 644  selinux.py $(PYLIBDIR)/site-packages/selinux/__init__.py
+	install -m 644 $(SWIGPYOUT) $(PYLIBDIR)/site-packages/selinux/__init__.py
 
 install-rubywrap: rubywrap
 	test -d $(RUBYINSTALL) || install -m 755 -d $(RUBYINSTALL)