bug in contrib-global.mk

The rule to build .sql for contrib fails, currently its

ifneq (,$(MODULES)$(MODULE_big))
%.sql: %.sql.in
sed 's,MODULE_PATHNAME,$$libdir/$*,g' $< >$@
endif

$libdir never gets substituted, it should be

%.sql: %.sql.in
sed 's,MODULE_PATHNAME,$(libdir)/$*,g' $< >$@

running:

sed 3.02-8
make 3.79.1-11
bash 2.05a-4