python3: don't use wcsftime() on uClibc

As investigated in bug #7646, wcsftime() doesn't work properly with
uClibc. Until it gets fixed in uClibc, let's tell Python 3 to not use
it. Python 3 will fall back to strftime(), which works properly.

[Peter: fix typo in comment]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Cc: Beyonlo <beyonlo@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/python3/python3.mk

@@ -107,6 +107,12 @@ PYTHON3_CONF_ENV += \
 	ac_cv_file__dev_ptc=yes \
 	ac_cv_working_tzset=yes
 
+# uClibc is known to have a broken wcsftime() implementation, so tell
+# Python 3 to fall back to strftime() instead.
+ifeq ($(BR2_TOOLCHAIN_USES_UCLIBC),y)
+PYTHON3_CONF_ENV += ac_cv_func_wcsftime=no
+endif
+
 PYTHON3_CONF_OPTS += \
 	--without-ensurepip	\
 	--without-cxx-main 	\