util/inteltool/Makefile: improve cross-compilation support

Use tool from INSTALL variable to create directory instead of mkdir to
be compatible with other cross-compilation buildsystems (like Yocto).

Signed-off-by: Maciej Gabryelski <maciej.gabryelski@3mdeb.com>
Change-Id: I0b0949d07baae1ae1d7b22ac3d0b8913f81d89c1
Reviewed-on: https://review.coreboot.org/c/coreboot/+/70104
Reviewed-by: Michał Żygowski <michal.zygowski@3mdeb.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/util/inteltool/Makefile b/util/inteltool/Makefile
index 3b692fd..e6e122b 100644
--- a/util/inteltool/Makefile
+++ b/util/inteltool/Makefile
@@ -77,9 +77,9 @@
 	@rm -rf .test.c .test .test.dSYM
 
 install: $(PROGRAM)
-	mkdir -p $(DESTDIR)$(PREFIX)/sbin
+	$(INSTALL) -d $(DESTDIR)$(PREFIX)/sbin
 	$(INSTALL) $(PROGRAM) $(DESTDIR)$(PREFIX)/sbin
-	mkdir -p $(DESTDIR)$(PREFIX)/share/man/man8
+	$(INSTALL) -d $(DESTDIR)$(PREFIX)/share/man/man8
 	$(INSTALL) -p -m644 $(PROGRAM).8 $(DESTDIR)$(PREFIX)/share/man/man8
 
 .PHONY: all clean distclean dep pciutils