Support new randomness generation in AWS-LC

[torben-hansen]

Description of changes:

aws/aws-lc#2220 introduces a new method to import Jitter Entropy and previous PRs added Jitter Entropy for all build types.

This didn't quite work with aws-lc-rs build that only expected Jitter Entropy for some select FIPS builds.

Testing:

Following succeded"

git clone https://github.com/aws/aws-lc-rs.git
cd aws-lc-rs/
git fetch origin pull/708/head:PR708
git checkout PR708
cd aws-lc-sys/
rm -rf aws-lc/
git clone https://github.com/aws/aws-lc.git
cd aws-lc/
git fetch origin pull/2220/head:PR2220
git checkout PR2220
cd ../..
AWS_LC_SYS_NO_PREFIX=1 AWS_LC_SYS_C_STD=99 cargo test -p aws-lc-sys --features bindgen
./scripts/build/collect_symbols.sh -c aws-lc-sys
./scripts/generate/_generate_prefix_headers.sh -c aws-lc-sys
./scripts/ci/update_sys_crate_metadata.sh aws-lc-sys
AWS_LC_SYS_PREGENERATING_BINDINGS=1 cargo test -p aws-lc-sys --features bindgen
./scripts/build/collect_build_src.sh

It simulates https://github.com/aws/aws-lc/blob/main/.github/workflows/aws-lc-rs.yml#L16 with aws/aws-lc#2220.

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.

[torben-hansen]

I'm implementation the new randomness generation and importing jitter entropy in a new way. Jitter entropy is causing issues with the aws-lc-rs build. aws/aws-lc#2220 shows the current problems.

Firstly, problem with prefixing. Build errors such as

= note:    Creating library D:\a\aws-lc\aws-lc\aws-lc-rs\target\x86_64-pc-windows-msvc\debug\deps\sanity_tests-57e4e5ae6f1e6b01.lib and object D:\a\aws-lc\aws-lc\aws-lc-rs\target\x86_64-pc-windows-msvc\debug\deps\sanity_tests-57e4e5ae6f1e6b01.exp␍
          libaws_lc_sys-c0626afe81e8cfa8.rlib(bcm.obj) : error LNK2019: unresolved external symbol aws_lc_0_26_0_jent_read_entropy referenced in function tree_jitter_get_root_seed␍
          libaws_lc_sys-c0626afe81e8cfa8.rlib(bcm.obj) : error LNK2019: unresolved external symbol aws_lc_0_26_0_jent_entropy_collector_alloc referenced in function tree_jitter_get_root_seed␍
          libaws_lc_sys-c06[26](https://github.com/aws/aws-lc/actions/runs/13525047210/job/37793340748?pr=2220#step:13:27)afe81e8cfa8.rlib(bcm.obj) : error LNK2019: unresolved external symbol aws_lc_0_26_0_jent_entropy_collector_free referenced in function tree_jitter_get_root_seed␍
          D:\a\aws-lc\aws-lc\aws-lc-rs\target\x86_64-pc-windows-msvc\debug\deps\sanity_tests-57e4e5ae6f1e6b01.exe : fatal error LNK1120: 3 unresolved externals␍

I think this can be resolved by just filtering them out during symbol analysis.

The second problem is something like this:

 exit status: 0
  cargo:warning=In file included from /home/runner/work/aws-lc/aws-lc/aws-lc-rs/aws-lc-sys/aws-lc/third_party/jitterentropy/jitterentropy-library/src/jitterentropy-gcd.h:23,
  cargo:warning=                 from /home/runner/work/aws-lc/aws-lc/aws-lc-rs/aws-lc-sys/aws-lc/third_party/jitterentropy/jitterentropy-library/src/jitterentropy-base.c:33:
  cargo:warning=/home/runner/work/aws-lc/aws-lc/aws-lc-rs/aws-lc-sys/aws-lc/third_party/jitterentropy/jitterentropy-library/src/jitterentropy-internal.h:45:10: fatal error: jitterentropy.h: No such file or directory
  cargo:warning=   45 | #include "jitterentropy.h"

Not sure what that is about atm.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.89%. Comparing base (c358484) to head (6c2615c).
Report is 177 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #708      +/-   ##
==========================================
- Coverage   95.80%   92.89%   -2.91%     
==========================================
  Files          61       70       +9     
  Lines        8143     9538    +1395     
  Branches        0     9538    +9538     
==========================================
+ Hits         7801     8860    +1059     
- Misses        342      412      +70     
- Partials        0      266     +266     

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