Add a note to src/Makefile that explains that 'rm' runs twice because the second invocation only needs to operate on files with the immutable flag set.
Add a note to src/Makefile that explains that 'rm' runs twice because the
second invocation only needs to operate on files with the immutable flag
set.

Submitted by:		arundel (via private email) (original version)
Discussed on:		-toolchain@
MFC after:		3 days

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