python: workaround distutils issue with binary extensions

distutils adds -L$LIBDIR (/usr/lib), breaking build of binary extensions.
Seen with netifaces, but other extensions may be affected as well.

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/python/python.mk

@@ -131,6 +131,15 @@ PYTHON_MAKE_ENV = \
 	PYTHON_MODULES_INCLUDE=$(STAGING_DIR)/usr/include \
 	PYTHON_MODULES_LIB="$(STAGING_DIR)/lib $(STAGING_DIR)/usr/lib"
 
+# python distutils adds -L$LIBDIR when linking binary extensions, causing
+# trouble for cross compilation
+define PYTHON_FIXUP_LIBDIR
+	$(SED) 's|^LIBDIR=.*|LIBDIR= $(STAGING_DIR)/usr/lib|' \
+	   $(STAGING_DIR)/usr/lib/python$(PYTHON_VERSION_MAJOR)/config/Makefile
+endef
+
+PYTHON_POST_INSTALL_STAGING_HOOKS += PYTHON_FIXUP_LIBDIR
+
 #
 # Development files removal
 #