antlr4-cppruntime: add version 4.12.0

[toge]

Specify library name and version: antlr4-cppruntime/4.12.0

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• I've read the contributing guidelines.
• I've used a recent Conan client version close to the currently deployed.
• I've tried at least one configuration locally with the conan-center hook activated.

[conan-center-bot]

Conan v1 pipeline ✔️

All green in build 1 (1f44badb727bee8bf437fc16f9a4a3499bffc6a8):

• antlr4-cppruntime/4.11.1@:
  All packages built successfully! (All logs)

• antlr4-cppruntime/4.10.1@:
  All packages built successfully! (All logs)

• antlr4-cppruntime/4.9.3@:
  All packages built successfully! (All logs)

• antlr4-cppruntime/4.12.0@:
  All packages built successfully! (All logs)

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Conan v2 pipeline (informative, not required for merge) ✔️

Note: Conan v2 builds are informative and they are not required for the PR to be merged.

All green in build 1 (1f44badb727bee8bf437fc16f9a4a3499bffc6a8):

• antlr4-cppruntime/4.12.0@:
  All packages built successfully! (All logs)

• antlr4-cppruntime/4.11.1@:
  All packages built successfully! (All logs)

• antlr4-cppruntime/4.10.1@:
  All packages built successfully! (All logs)

• antlr4-cppruntime/4.9.3@:
  All packages built successfully! (All logs)

[ghost]

I detected other pull requests that are modifying antlr4-cppruntime/all recipe:

• antlr4-cppruntime: Upgrade to 4.12.0 #16328

This message is automatically generated by https://github.com/ericLemanissier/conan-center-conflicting-prs so don't hesitate to report issues/improvements there.

[michalwidera]

LGTM - look's like this change fixes V2 issues.
I think that #16328 could be dropped.
(ok look's like there is no magic - @spacelm explaied that both solutions are ok - this one occurred before c3i maintenance when v2 profiles did not force a specific compiler.cppstd)

[michalwidera]

@toge - there are two 4.12.0 bump PR's - Yours and @0xFireWolf #16328
The second author mention one valid argument:
'Besides, #16159 does not use the new CMake options ANTLR_BUILD_SHARED and ANTLR_BUILD_STATIC that can reduce the compile time by 50%.'
Can you improve yours or merge both somehow.
I personally would like to have best code as possible here.