Remove unnecessary exports of HOST_SYS and BUILD_SYS in python-based recipes

They are no longer required to build python software.

Signed-off-by: Alexander Kanavin <alexander.kanavin@linux.intel.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>

meta-python/recipes-devtools/python/python-vcversioner_2.14.0.0.bb

@@ -10,7 +10,6 @@ SRC_URI[sha256sum] = "acd43686e92e6c8bbeb4f2eef54408567a7adea9692fa72d591eec5357
 inherit pypi setuptools
 
 do_compile_append() {
-    export BUILD_SYS=${BUILD_SYS} HOST_SYS=${HOST_SYS}
     ${PYTHON} setup.py -q bdist_egg --dist-dir ./
 }