tools: require coreutils to build findutils

The install stage of findutils uses the install utility
with GNU options which is provided to macOS by coreutils.

Before, Make coincidentally built them in the right order,
this makes the prerequisite explicit.

Tested-by: Georgi Valkov <[email protected]> # macOS
Signed-off-by: Michael Pratt <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/16522
Signed-off-by: Robert Marko <[email protected]>

tools/Makefile

@@ -143,6 +143,7 @@ else
 endif
 ifneq ($(filter coreutils,$(tools-y)),)
   $(curdir)/elfutils/compile += $(curdir)/coreutils/compile
+  $(curdir)/findutils/compile += $(curdir)/coreutils/compile
   $(curdir)/squashfs4/compile += $(curdir)/coreutils/compile
 endif