patch.bbclass: remove useless path assignment

A path variable is assigned the value of PATH from the
environment, before the PATH is set on the environemnt
from the value of PATH in the bb datastore. This seems
to be an unnecessary leftover.

[YOCTO #8543]

(From OE-Core rev: a3c7c5148017c652661f2c5f79d90aa80dcb479b)

Signed-off-by: Alex Franco <alejandro.franco@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/patch.bbclass

@@ -136,7 +136,6 @@ python patch_do_patch() {
 
     s = d.getVar('S', True)
 
-    path = os.getenv('PATH')
     os.putenv('PATH', d.getVar('PATH', True))
 
     # We must use one TMPDIR per process so that the "patch" processes