package/libcurl: remove configure option --with-random

Upstream removed this configure option in version 8.10.0:
https://github.com/curl/curl/commit/269fdd4c6ed5d837d57448ac977f6f300968df15
which was added to buildroot with commit
d68b999787a0e0838c3bb2d5966f11d8a349a49b.

Signed-off-by: Bernd Kuhls <bernd@kuhls.net>
Signed-off-by: Julien Olivain <ju.o@free.fr>

package/libcurl/libcurl.mk

@@ -20,7 +20,6 @@ LIBCURL_INSTALL_STAGING = YES
 LIBCURL_CONF_OPTS = \
 	--disable-manual \
 	--disable-ntlm \
-	--with-random=/dev/urandom \
 	--disable-curldebug \
 	--disable-libcurl-option \
 	--disable-ldap \