Convert to new override syntax

This is the result of automated script (0.9.1) conversion:

oe-core/scripts/contrib/convert-overrides.py .

converting the metadata to use ":" as the override character instead of "_".

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>

meta-networking/recipes-protocols/pptp-linux/pptp-linux_1.10.0.bb

@@ -29,4 +29,4 @@ do_install() {
     install -m 644 ${WORKDIR}/options.pptp ${D}${sysconfdir}/ppp
 }
 
-RDEPENDS_${PN} = "ppp"
+RDEPENDS:${PN} = "ppp"