[libvirt] [PATCH] m4: fix pkgcheck detection

[Olaf Hering]

AC_PATH_PROG searches either for a binary [pkcheck], or it uses the
user provided absolute path in the variable PKCHECK_PATH.
Since virt-polkit.m4 wipes the variable PKCHECK_PATH from environment
the user decision is never used.

Signed-off-by: Olaf Hering <olaf at aepfle.de>

--- a/m4/virt-polkit.m4
+++ b/m4/virt-polkit.m4
@@ -28,7 +28,6 @@ AC_DEFUN([LIBVIRT_CHECK_POLKIT], [
   POLKIT_REQUIRED="0.6"
   POLKIT_CFLAGS=
   POLKIT_LIBS=
-  PKCHECK_PATH=
 
   with_polkit0=no
   with_polkit1=no