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Jacob Wujciak-Jens authored and GitHub committed adef53715b5
GH-39549: [C++] Pass -jN to make in external projects (#39550) ### Rationale for this change Previous issues with sub-make fragility are no longer an issue with our new minimum CMake version 3.16. ### What changes are included in this PR? Remove special casing from jemalloc, pass -jN to all make based eps. ### Are these changes tested? CI * Closes: #39549 Authored-by: Jacob Wujciak-Jens <jacob@wujciak.de> Signed-off-by: Jacob Wujciak-Jens <jacob@wujciak.de>