crypto: add guards and adjust tests for BoringSSL

[panva]

This reduces the number of patches needed to make Node.js compile and test crypto/webcrypto when running linked against BoringSSL (date below)

Version / tag: 0.20260327.0 (dated 2026-03-27)
Source:        https://boringssl.googlesource.com/boringssl
Rev:           refs/tags/0.20260327.0
Nixpkgs pin:   ab72be9733b41190ea34f1422a3e4e243ede7533

Some of the patches have been adapted from these sources:

• https://github.com/electron/electron/blob/44e483958008f5f883ade669b151d4e253478a22/patches/node/fix_handle_boringssl_and_openssl_incompatibilities.patch
• https://github.com/electron/electron/blob/44e483958008f5f883ade669b151d4e253478a22/patches/node/fix_crypto_tests_to_run_with_bssl.patch

ncrypto changes are already in / from https://github.com/nodejs/ncrypto/blob/88555cc07e8ffcfdbbab779e86cc6225317ee6ae/include/ncrypto.h#L332-L343 / https://github.com/nodejs/ncrypto/blob/88555cc07e8ffcfdbbab779e86cc6225317ee6ae/src/ncrypto.cpp#L3240-L3248

[nodejs-github-bot]

Review requested:

• @nodejs/crypto
• @nodejs/security-wg

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 89.59%. Comparing base (c29a34c) to head (a246642).
⚠️ Report is 11 commits behind head on main.

Files with missing lines	Patch %	Lines
src/crypto/crypto_dh.cc	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #62883      +/-   ##
==========================================
- Coverage   89.62%   89.59%   -0.04%     
==========================================
  Files         706      706              
  Lines      219165   219180      +15     
  Branches    41989    41997       +8     
==========================================
- Hits       196435   196373      -62     
- Misses      14621    14687      +66     
- Partials     8109     8120      +11     

Files with missing lines	Coverage Δ
src/crypto/crypto_cipher.cc	77.43% <ø> (ø)
src/crypto/crypto_context.cc	72.09% <ø> (+0.08%)	⬆️
src/crypto/crypto_rsa.cc	65.65% <ø> (ø)
src/crypto/crypto_util.cc	73.18% <ø> (ø)
src/crypto/crypto_dh.cc	67.59% <0.00%> (-0.21%)	⬇️

... and 35 files with indirect coverage changes

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