package/pkg-python: fix python 3.8.0 package builds

We need to update the sysconfigdata path for python 3.8.0 per upstream
commit 7efc526e5cfb929a79c192ac2dcf7eb78d3a4401 which indicates the "m"
flag has been removed from sys.abiflags.

Fixes this build error when building target packages:
ValueError: Empty module name

Signed-off-by: James Hilliard <james.hilliard1@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/pkg-python.mk

@@ -21,7 +21,7 @@
 ################################################################################
 
 define PKG_PYTHON_SYSCONFIGDATA_NAME
-$(basename $(notdir $(wildcard $(STAGING_DIR)/usr/lib/python$(PYTHON3_VERSION_MAJOR)/_sysconfigdata_m_linux_*.py)))
+$(basename $(notdir $(wildcard $(STAGING_DIR)/usr/lib/python$(PYTHON3_VERSION_MAJOR)/_sysconfigdata__linux_*.py)))
 endef
 
 # Target distutils-based packages