Makefile: only support building deps from submodule #23957
Merged
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as Makefile is now only intended for internal use, it doesn't make sense to support building from system-installed dependencies.
When building artifacts (which is now the primary purpose of Makefile), we are always building the dependencies from submodules (zlib being the only exception), so it doesn't make sense to keep all the complex Makefile machinery that tries to detect if dependencies are installed on the system etc. (e.g. the
..._CHECK_CMD
,HAS_SYSTEM_...
etc.)The result:
If this works out, the Makefile can be simplified even further in followup steps.