Patch #619493: Prefer rpmbuild over rpm if available.

Lib/distutils/command/bdist_rpm.py

@@ -280,6 +280,9 @@ class bdist_rpm (Command):
         # build package
         self.announce('building RPMs')
         rpm_cmd = ['rpm']
+        if os.path.exists('/usr/bin/rpmbuild') or \
+           os.path.exists('/bin/rpmbuild'):
+            rpm_cmd = ['rpmbuild']
         if self.source_only: # what kind of RPMs?
             rpm_cmd.append('-bs')
         elif self.binary_only: