package/python-sentry-sdk: drop httpx.py for python 2.x to fix pycompile issue

Drop httpx.py to fix the following build failure with python 2.x raised
since bump to version 1.4.3 in commit
fd684ab9f38ad908013d09fe7e46cebfada4406c and
https://github.com/getsentry/sentry-python/commit/e2d0893824481c9a5dd3141872d90d0888c4c5f8:

error:   File "/usr/lib/python2.7/site-packages/sentry_sdk/integrations/httpx.py", line 69
    async def send(self, request, **kwargs):
            ^

Fixes:
 - http://autobuild.buildroot.org/results/fd651abb3bc2fa33c861238acf1c4ad49fdac160

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/python-sentry-sdk/python-sentry-sdk.mk

@@ -15,7 +15,7 @@ ifeq ($(BR2_PACKAGE_PYTHON),y)
 # only needed/valid for python 3.x
 define PYTHON_SENTRY_SDK_RM_PY3_FILES
 	rm -f $(addprefix $(TARGET_DIR)/usr/lib/python*/site-packages/sentry_sdk/integrations/,\
-		aiohttp.py asgi.py django/asgi.py sanic.py tornado.py)
+		aiohttp.py asgi.py django/asgi.py httpx.py sanic.py tornado.py)
 endef
 
 PYTHON_SENTRY_SDK_POST_INSTALL_TARGET_HOOKS += PYTHON_SENTRY_SDK_RM_PY3_FILES