package/i2pd: 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/i2pd/i2pd.mk b/package/i2pd/i2pd.mk
index 1371e70..ef6a467 100644
--- a/package/i2pd/i2pd.mk
+++ b/package/i2pd/i2pd.mk
@@ -16,11 +16,6 @@
 
 I2PD_CONF_OPTS += -DWITH_GUI=OFF
 
-# 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.
-I2PD_CONF_OPTS += -DTHREADS_PTHREAD_ARG=OFF
-
 ifeq ($(BR2_TOOLCHAIN_HAS_LIBATOMIC),y)
 I2PD_CONF_OPTS += \
 	-DHAVE_CXX_ATOMICS_WITHOUT_LIB=OFF \