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Installing cURL properly on OpenWRT Chaos Calmer (15.05.1) for ar71xx TP-LINK MR3020

I installed cURL like this on OpenWRT, as I also hadn’t enough disk space available on the router, but when I tried to run it, it said:

# curl
curl: can't load library 'libmbedtls.so.9'

Okay, so just install libmbedtls, right? But it is not part of this repository. I found out that it’s present on this repository, so I tried to add it as a custom repo at /etc/opkg/customfeeds.conf and add mipsel_24kc as a custom architecture at /etc/opkg.conf, by appending a line arch mipsel_24kc 100 at the end of the file, hoping that mipsel_24kc would be compatible with ar71xx, but everything I got was a wall of text on my terminal every time I ran any opkg command with each line saying:

Package <package_name> version <version> has no valid architecture, ignoring.

And, to worsen it, it has all the dependencies installed, but still waits for a libmbedtls library that doesn’t exist on the repository.

# opkg depends curl
curl depends on:
    libc
    libcurl

# opkg install libc
Package libc (0.9.33.2-1) installed in root is up to date.

# opkg install libcurl
Package libcurl (7.40.0-3) installed in root is up to date.

# curl
curl: can't load library 'libmbedtls.so.9'

Also, I can’t update this OS. Any ideas about how to solve this issue?