Ios Build is failing for deltachatIos repo on Xcode 12.3

Delta Chat version: Latest

Expected behavior: Should atleast build

Actual behavior
Build is failing with multiple errors for iOS on xcode 12.3 macOS ! BigSur
Building “deltachat_ffi” for “aarch64-apple-ios”
Compiling proc-macro2 v1.0.24
Compiling syn v1.0.42
Compiling libc v0.2.78
Compiling memchr v2.3.3
error: linking with cc failed: exit code: 1
= note: “cc” “-m64”

should be able to build

Steps to reproduce the problem

Screen snapshots

Debug logs

If applicable, debug logs can be copied from within the Delta Chat app: 

Open the _Settings_ menu -> _About_ -> _version number|Info_.

Alternatively from the Android system log:

` adb logcat -v time -s DeltaChat `

This log contains private data (e.g. mail address, provider information) which shall be removed or anonymised prior to posting.