libselinux: do not duplicate make target when going into subdirectory

When running "make install-pywrap", make displays:

    make[1]: Entering directory '/root/selinux/libselinux'
    make -C src install-pywrap install-pywrap
    make[2]: Entering directory '/root/selinux/libselinux/src'

The duplicated "install-pywrap" is not expected. Remove it from the
Makefile.

Signed-off-by: Nicolas Iooss <nicolas.iooss@m4x.org>

libselinux/Makefile

@@ -50,24 +50,24 @@ all install relabel clean distclean indent:
 	done
 
 swigify: all
-	$(MAKE) -C src swigify $@
+	$(MAKE) -C src $@
 
 pywrap: 
-	$(MAKE) -C src pywrap $@
+	$(MAKE) -C src $@
 
 rubywrap: 
-	$(MAKE) -C src rubywrap $@
+	$(MAKE) -C src $@
 
 install-pywrap: 
-	$(MAKE) -C src install-pywrap $@
+	$(MAKE) -C src $@
 
 install-rubywrap: 
-	$(MAKE) -C src install-rubywrap $@
+	$(MAKE) -C src $@
 
 clean-pywrap:
-	$(MAKE) -C src clean-pywrap $@
+	$(MAKE) -C src $@
 
 clean-rubywrap:
-	$(MAKE) -C src clean-rubywrap $@
+	$(MAKE) -C src $@
 
 test: