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

[Zibi Sarbinowski via llvm-commits]

zibi2 wrote:

In a nutshell the issue is when `CRT_HAS_F128` is defined but `CRT_HAS_128BIT` has not.

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