libxml2: fixup configure options

Some configure options changed so adjust.
Forcibly disabling threads isn't good and also it's detected by
configure when there are no threads.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/libxml2/libxml2.mk

@@ -12,10 +12,7 @@ ifneq ($(BR2_LARGEFILE),y)
 LIBXML2_CONF_ENV = CC="$(TARGET_CC) $(TARGET_CFLAGS) -DNO_LARGEFILE_SOURCE"
 endif
 
-LIBXML2_CONF_OPT = --with-gnu-ld --enable-shared \
-		--enable-static \
-		--without-debugging --without-python \
-		--without-threads
+LIBXML2_CONF_OPT = --with-gnu-ld --without-python --without-debug
 
 define LIBXML2_STAGING_LIBXML2_CONFIG_FIXUP
 	$(SED) "s,^prefix=.*,prefix=\'$(STAGING_DIR)/usr\',g" $(STAGING_DIR)/usr/bin/xml2-config
@@ -26,9 +23,7 @@ LIBXML2_POST_INSTALL_STAGING_HOOKS += LIBXML2_STAGING_LIBXML2_CONFIG_FIXUP
 
 HOST_LIBXML2_DEPENDENCIES = host-pkg-config
 
-HOST_LIBXML2_CONF_OPT = \
-		--enable-shared --without-debugging --without-python \
-		--without-threads
+HOST_LIBXML2_CONF_OPT = --without-debug --without-python
 
 define LIBXML2_REMOVE_CONFIG_SCRIPTS
 	$(RM) -f $(TARGET_DIR)/usr/bin/xml2-config