[sr #108987] libtool doesn't like simple RM defined (without options)

Follow-up Comment #2, sr #108987 (project libtool):

It appears that the shell assignment expectation may be erroneous,
in that ": ${RM="rm -f"}" will only replace RM if RM is not defined.

perhaps what is intended is more along the lines of:
RM="${RM:=rm} -f"

(NB it would probably be easier to contend with separating
pure RM from, for example, RM_F (or RM_FORCE) for "rm -f").

This problematic construct seems to be found in at least the following files:
bootstrap, libtool.in, libtool.m4 and funclib.sh

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