PCRE2: Explicitly specify cmake c standard

[bryce-cahill]

• Fixes compilation issues with for loops

Specify library name and version: pcre2/10.42

Fixes #19725

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[SpaceIm]

According to PCRE2Project/pcre2#193:

• it's a recent change (PCRE2Project/pcre2@1c41a5b), so it shouldn't be forced for old versions
• it won't be needed for upcoming versions since it has been fixed upstream by build: make the C99 requirement explicit PCRE2Project/pcre2#193

Therefore I would recommend to patch impacted versions instead (10.40 & 10.42 I think)

[bryce-cahill]

Great point, thanks for the feedback 👍

I've replaced this with a patch for the 10.42 version instead.

[bryce-cahill]

Modified the patch so that it now cleanly applies to both 10.40 and 10.42

[AbrilRBS]

Please remember to sign the CLA so that your contribution can be merged, thanks! :)

[bryce-cahill]

Please remember to sign the CLA so that your contribution can be merged, thanks! :)

I've attempted to sign it twice but it appears to be stuck pending

[github-actions]

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[github-actions]

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[conan-center-bot]

Conan v1 pipeline ✔️

All green in build 2 (efee488343d75953260497a827c71c9dd9146bce):

• pcre2/10.40:
  Built 20 packages out of 22 (All logs)

• pcre2/10.39:
  Built 20 packages out of 22 (All logs)

• pcre2/10.37:
  Built 20 packages out of 22 (All logs)

• pcre2/10.43:
  Built 20 packages out of 22 (All logs)

• pcre2/10.32:
  Built 20 packages out of 22 (All logs)

• pcre2/10.33:
  Built 20 packages out of 22 (All logs)

• pcre2/10.44:
  Built 20 packages out of 22 (All logs)

• pcre2/10.35:
  Built 20 packages out of 22 (All logs)

• pcre2/10.36:
  Built 20 packages out of 22 (All logs)

• pcre2/10.42:
  Built 20 packages out of 22 (All logs)

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Conan v2 pipeline ✔️

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All green in build 1 (efee488343d75953260497a827c71c9dd9146bce):

• pcre2/10.42:
  All packages built successfully! (All logs)

• pcre2/10.43:
  All packages built successfully! (All logs)

• pcre2/10.39:
  All packages built successfully! (All logs)

• pcre2/10.40:
  All packages built successfully! (All logs)

• pcre2/10.35:
  All packages built successfully! (All logs)

• pcre2/10.37:
  All packages built successfully! (All logs)

• pcre2/10.36:
  All packages built successfully! (All logs)

• pcre2/10.33:
  All packages built successfully! (All logs)

• pcre2/10.32:
  All packages built successfully! (All logs)