Potential Vulnerability in Cloned Code

[ivanaclairineirsan]

This PR fixes a potential security vulnerability in texk/web2c/mfluadir/otfcc/dep/extern/sds.c

###Details:
Affected File: texk/web2c/mfluadir/otfcc/dep/extern/sds.c
Original Fix: redis/redis@c6ad876

###What this PR does:
This PR applies the same security patch that was applied to the original repository to eliminate the potential vulnerability in the cloned code.

###References:

• https://nvd.nist.gov/vuln/detail/CVE-2021-41099

[gucci-on-fleek]

Thanks for the PR. mflua isn't security-sensitive (since I can't really imagine a case where you'd run it on untrusted input), but this fix looks reasonable to me. I've forwarded it to the mflua maintainer, and him or I will get back to you if/when it's merged.