package/xerces: drop cmake workaround

Drop workaround for cmake < 3.10 (not needed since commit
d4773b610a40be1d3ac7d793033abaf4eb2491ed)

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
diff --git a/package/xerces/xerces.mk b/package/xerces/xerces.mk
index d9174b4..a3e5361 100644
--- a/package/xerces/xerces.mk
+++ b/package/xerces/xerces.mk
@@ -19,11 +19,6 @@
 
 XERCES_POST_PATCH_HOOKS += XERCES_DISABLE_SAMPLES
 
-# Before CMake 3.10, passing THREADS_PTHREAD_ARG=OFF was needed to
-# disable a try_run() call in the FindThreads tests, which caused a
-# build failure when cross-compiling.
-XERCES_CONF_OPTS += -DTHREADS_PTHREAD_ARG=OFF
-
 ifeq ($(BR2_PACKAGE_ICU),y)
 XERCES_DEPENDENCIES += icu
 endif