subst.mk is a Makefile fragment that implements a general text replacement

facility for different classes of files in ${WRKSRC}.  For each class of
files, a target <class>-subst is created to perform the text replacement.

The following variables are used:

SUBST_STAGE.<class>
	"stage" at which we do the text replacement, e.g. pre-configure,
	post-build, etc.

SUBST_MESSAGE.<class>
	message to display, noting what is being substituted

SUBST_FILES.<class>
	files on which to run the substitution; these are relative to
	${WRKSRC}

SUBST_SED.<class>
	sed(1) substitution expression to run on the specified files

This basically extracts a useful piece of code from bsd.buildlink2.mk and
puts it in a place that allows it to be more widely used, and so that the
functionality doesn't depend on USE_BUILDLINK2 being defined.

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