Revert `-ffile-prefix-map` usage w/ CMake

aws / aws-lc-rs

aws-lc-rs is a cryptographic library using AWS-LC for its cryptographic operations. The library strives to be API-compatible with the popular Rust library named ring.

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Problem

Consumers using older GCC compilers (< v8.1) with the AWS_LC_SYS_CMAKE_BUILDER=1 environment variable set experience build failures due to GCC lacking support for the -ffile-prefix-map= option.
For x86 (32-bit) builds, older GCC compilers do not assume the availability of SSE2. However, SSE2 is required by AWS-LC assembly.

Description of changes:

Comment out the use of -ffile-prefix-map= for the CMake builder until we have a better solution.
Sets the -msse2 compiler option on x86 builds that use the "cc" builder.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license and the ISC license.

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 92.52%. Comparing base (c358484) to head (6709e7c). Report is 78 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #526 +/- ## ========================================== - Coverage 95.80% 92.52% -3.28% ========================================== Files 61 67 +6 Lines 8143 9277 +1134 Branches 0 9277 +9277 ========================================== + Hits 7801 8584 +783 - Misses 342 422 +80 - Partials 0 271 +271 ```

aws / aws-lc-rs