I have compiled busybox to include wget, because of reasonable timeout-handling. But uclient-fetch is still used to emulate wget.
This is a regression, as it was a bug in 15.05, fixed later on, and now back again.
When I build from master, I see
jeff@deb-devel:~/devel/openwrt/bin/targets/x86/64$ tar tvf openwrt-x86-64-generic-rootfs.tar.gz | fgrep wget
lrwxrwxrwx 0/0 0 2019-07-30 01:42 ./usr/bin/wget -> /usr/bin/wget-ssl
-rwxr-xr-x 0/0 427585 2019-07-30 01:42 ./usr/bin/wget-ssl
-rw-r--r-- 0/0 779 2019-07-30 01:42 ./usr/lib/opkg/info/wget.control
-rw-r--r-- 0/0 18 2019-07-30 01:42 ./usr/lib/opkg/info/wget.list
-rwxr-xr-x 0/0 117 2019-07-30 01:42 ./usr/lib/opkg/info/wget.prerm
which looks as though wget is wget, not the busybox version.
Where do you see it being "emulated"?
After flashing my custom image to my router:
....
root@blabla:~# which wget
/usr/bin/wget
root@blabla:~# ls -l /usr/bin/wget
lrwxrwxrwx 1 root root 18 Jul 29 16:44 /usr/bin/wget -> /bin/uclient-fetch
Which is usually correct, but I am using
CONFIG_BUSYBOX_CONFIG_WGET=y
CONFIG_BUSYBOX_CONFIG_FEATURE_WGET_LONG_OPTIONS=y
which should have preference, then.
Hmmm, not clear where the "problem" is (as I agree that wget should be preferred to uclient-fetch if TLS is enabled) I also see
jeff@deb-devel:~/devel/openwrt/bin/targets/x86/64$ tar tvf openwrt-x86-64-generic-rootfs.tar.gz | fgrep uclient
-rwxr-xr-x 0/0 24595 2019-07-30 01:42 ./bin/uclient-fetch
-rw-r--r-- 0/0 28674 2019-07-30 01:42 ./usr/lib/libuclient.so
-rw-r--r-- 0/0 312 2019-07-30 01:42 ./usr/lib/opkg/info/libuclient20160123.control
-rw-r--r-- 0/0 23 2019-07-30 01:42 ./usr/lib/opkg/info/libuclient20160123.list
-rwxr-xr-x 0/0 117 2019-07-30 01:42 ./usr/lib/opkg/info/libuclient20160123.prerm
-rw-r--r-- 0/0 371 2019-07-30 01:42 ./usr/lib/opkg/info/uclient-fetch.control
-rw-r--r-- 0/0 19 2019-07-30 01:42 ./usr/lib/opkg/info/uclient-fetch.list
-rwxr-xr-x 0/0 117 2019-07-30 01:42 ./usr/lib/opkg/info/uclient-fetch.prerm
Edit: For reference, this is what I happened to have in this specific build, after adding wget
CONFIG_TARGET_x86=y
CONFIG_TARGET_x86_64=y
CONFIG_TARGET_x86_64_Generic=y
CONFIG_DEVEL=y
CONFIG_BUILD_LOG=y
CONFIG_CCACHE=y
CONFIG_DOWNLOAD_FOLDER="/home/jeff/devel/openwrt_dl"
CONFIG_OPENSSL_ENGINE=y
CONFIG_OPENSSL_OPTIMIZE_SPEED=y
CONFIG_OPENSSL_WITH_ASM=y
CONFIG_OPENSSL_WITH_CHACHA_POLY1305=y
CONFIG_OPENSSL_WITH_CMS=y
CONFIG_OPENSSL_WITH_DEPRECATED=y
CONFIG_OPENSSL_WITH_EC=y
CONFIG_OPENSSL_WITH_ERROR_MESSAGES=y
CONFIG_OPENSSL_WITH_PSK=y
CONFIG_OPENSSL_WITH_SRP=y
CONFIG_OPENSSL_WITH_TLS13=y
CONFIG_PACKAGE_libbz2=y
CONFIG_PACKAGE_libffi=y
CONFIG_PACKAGE_libopenssl=y
CONFIG_PACKAGE_libpcre=y
CONFIG_PACKAGE_python3-base=y
CONFIG_PACKAGE_python3-light=y
CONFIG_PACKAGE_python3-paho-mqtt=y
CONFIG_PACKAGE_wget=y
CONFIG_PACKAGE_zlib=y