build: add GNU install to prerequisites

The recent removal of usbutils from core and replacement by hwdata in
packages has exposed hwdata's requirement for certain GNU options on
'install' (-T)  Other packages (sqm-scripts) have openwrt specific
makefile sections to avoid GNU options but I suspect this is going to
get harder in the future.

Add GNU install as a prerequisite and link into
$STAGING_DIR/host/etc/bin as per similar GNU utils

This resolves an issue building under MacOS which would otherwise use a
non-GNU options aware version of 'install'

Signed-off-by: Kevin Darbyshire-Bryant <[email protected]>

include/prereq-build.mk

@@ -136,6 +136,10 @@ $(eval $(call SetupHostCommand,bzip2,Please install 'bzip2', \
 $(eval $(call SetupHostCommand,wget,Please install GNU 'wget', \
 	wget --version | grep GNU))
 
+$(eval $(call SetupHostCommand,install,Please install GNU 'install', \
+	install --version | grep GNU, \
+	ginstall --version | grep GNU))
+
 $(eval $(call SetupHostCommand,perl,Please install Perl 5.x, \
 	perl --version | grep "perl.*v5"))