bitbake.conf/recipes: Introduce add DEV_PKG_DEPENDENCY to change RDEPENDS:${PN}-dev

There is a pattern that several recipes need to break the dependency of ${PN}-dev
on ${PN}, most often as ${PN} may be be empty. Add a new variable to parameterise
this and allow it to be changed more easily.

(From OE-Core rev: a5b381c0f45c590a762647a9956a8f41e2e2315e)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/python/python3_3.10.5.bb

@@ -416,7 +416,7 @@ RDEPENDS:${PN}-ptest = "${PN}-modules ${PN}-tests ${PN}-dev unzip bzip2 libgcc t
 RDEPENDS:${PN}-ptest:append:libc-glibc = " locale-base-tr-tr.iso-8859-9"
 RDEPENDS:${PN}-tkinter += "${@bb.utils.contains('PACKAGECONFIG', 'tk', '${MLPREFIX}tk ${MLPREFIX}tk-lib', '', d)}"
 RDEPENDS:${PN}-idle += "${@bb.utils.contains('PACKAGECONFIG', 'tk', '${PN}-tkinter ${MLPREFIX}tcl', '', d)}"
-RDEPENDS:${PN}-dev = ""
+DEV_PKG_DEPENDENCY = ""
 RDEPENDS:${PN}-pydoc += "${PN}-io"
 
 RDEPENDS:${PN}-tests:append:class-target = " ${MLPREFIX}bash"