[gettext-libintl] Handle atypical Linux installations #39662
Merged
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Fix
libintl.h
detection on atypical Linux systems such as NixOS. Resolves #39641.Adjust messages to cover musl libc systems. Resolves #39617. (Based on #39659.)
Add triplet variable to force build on linux. Useful for musl libc systems.
Report detected header location. Useful to discover inconsistencies. (My linux cross builds still detect the host header. The error message is unaware of cross builds.)