[libvirt] [libvirt-python] Use user requested python binary for setup.py

[Doug Goldstein]

When setup.py is kicked off with a python interpreter other than the
system 'python', (e.g. python2.7 setup.py build) the build process would
switch to 'python' and not use python2.7 as requested by the user. We
should always respect the user requested python interpreter and use it.
---
 setup.py | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/setup.py b/setup.py
index ecbce1f..24d4cf2 100755
--- a/setup.py
+++ b/setup.py
@@ -122,10 +122,10 @@ class my_build(build):
     def run(self):
         apis = get_api_xml_files()
 
-        self.spawn(["python", "generator.py", "libvirt", apis[0]])
-        self.spawn(["python", "generator.py", "libvirt-qemu", apis[1]])
+        self.spawn([sys.executable, "generator.py", "libvirt", apis[0]])
+        self.spawn([sys.executable, "generator.py", "libvirt-qemu", apis[1]])
         if have_libvirt_lxc:
-            self.spawn(["python", "generator.py", "libvirt-lxc", apis[2]])
+            self.spawn([sys.executable, "generator.py", "libvirt-lxc", apis[2]])
 
         build.run(self)
 
@@ -267,7 +267,7 @@ class my_test(Command):
 
         apis = get_api_xml_files()
 
-        self.spawn(["python", "sanitytest.py", self.build_platlib, apis[0]])
+        self.spawn([sys.executable, "sanitytest.py", self.build_platlib, apis[0]])
 
 
 class my_clean(clean):
-- 
1.8.3.2