meta-digi: remove ALLOW_EMPTY hacks for libdigi and microwindows

Those hacks were added to fix a problem when building development images
(with 'dev-pkgs' image feature enabled). In that case the developemnt
packages (libdigi-dev and microwindows-dev) have a dependence on the
normal packages (libdigi and microwindows). But those packages are not
created by default because they are empty, thus the needed ALLOW_EMPTY hack.

Fix the problem by just resetting the runtime dependences of the -dev
packages. This allows to not create empty libdigi and microwindows
packages.

Signed-off-by: Javier Viguera <javier.viguera@digi.com>

meta-digi-arm/recipes-bsp/libdigi/libdigi.bb

@@ -37,6 +37,6 @@ do_install() {
 	install -m 0644 cmdopt.h crc32.h digi-platforms.h log.h mem.h misc_helper.h ${D}/usr/include/libdigi
 }
 
-ALLOW_EMPTY_${PN} = "1"
+RDEPENDS_${PN}-dev = ""
 
 PACKAGE_ARCH = "${MACHINE_ARCH}"

meta-digi-dey/recipes-graphics/microwindows/microwindows_0.91.bb

@@ -29,4 +29,4 @@ do_install() {
 	oe_runmake install
 }
 
-ALLOW_EMPTY_${PN} = "1"
+RDEPENDS_${PN}-dev = ""