[compiler-rt] [builtins] Fix divtc3.c etc. compilation on Solaris/SPARC with gcc (PR #101662)

[Sean Perry via llvm-commits]

perry-ca wrote:

The z/OS port is not a WIP.  It's real and we are in the process of upstreaming everything.  These breakages impact us and delay us being able to upstream everything.  Alex and I worked on getting things working.  I'd like to keep it working.  

https://github.com/llvm/llvm-project/pull/101662