Tracker for adding glslang support for versioned shared objects / DLLs

This issue tracks the work being done to add support for versioned shared objects / DLLs for glslang.

- [x] Untangle cyclic build target dependencies. **Status: Done** - #2271
- [x] Switch to using [Semantic Versioning](https://semver.org/). **Status: Done** - #2277
- [x] Add `SONAME` library versioning. **Status: Done** - #2277
- [x] Add presubmit builds for CMake, Android.mk. **Status: Done** - #2281
- [x] Add presubmit builds for shared objects. **Status: Done** - #2286
- [x] `glslang`
- [x] Reduce `glslang` exported symbols to public API. **Status: Done** - #2303
- [x] Export DLL `glslang` public API symbols. **Status: Done** - #2303
- [x] `SPIRV`
- [x] Determine `SPIRV` public API. **Status: in progress** - #2308
- [x] Reduce `SPIRV` symbols to public API. **Status: in progress** - #3705
- [x] Export DLL `SPIRV` API symbols. **Status: Not started**
- [x] Fix [ODR](https://github.com/KhronosGroup/glslang/issues/2346) violations between `glslang` and `SPIRV` shared objects. **Status: Done** - #3698
- [ ] Presubmit detection & warnings when making breaking API changes without bumping major version. **Status: Not started**

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Related issues: #1255, #1421, #1484, #2147, #2267

No source file, test, or entry point is named. Start by investigating the remaining presubmit detection and warnings for breaking API changes without a major-version bump; done means this check is implemented and the listed versioning and shared-object work is complete.

Written by the indexing model from the issue text.