install: import new version of lib/tcl.m4

Import new version of tcl.m4 for compatibility with autoconf >=2.69.

File is imported from https://github.com/tcltk/tclconfig.
This commit is contained in:
Xavier Delaruelle
2021-02-14 16:23:36 +01:00
parent 9e5ea5d028
commit 5cf1a53043

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