osmocom: Introduce META_TELEPHONY_OSMO_INC to easily bump version

For libosmocore updates we need a nice way to rebuild all libraries
using it. This can be done using the META_TELEPHONY_OSMO_INC variable.
diff --git a/conf/layer.conf b/conf/layer.conf
index 8162d1a..8d40b7b 100644
--- a/conf/layer.conf
+++ b/conf/layer.conf
@@ -9,3 +9,4 @@
 BBFILE_PATTERN_telephony := "^${LAYERDIR}/"
 BBFILE_PRIORITY_telephony = "5"
 
+META_TELEPHONY_OSMO_INC = "1"
diff --git a/recipes-osmocom/libosmo-abis/libosmo-abis.inc b/recipes-osmocom/libosmo-abis/libosmo-abis.inc
index 0632247..acfe526 100644
--- a/recipes-osmocom/libosmo-abis/libosmo-abis.inc
+++ b/recipes-osmocom/libosmo-abis/libosmo-abis.inc
@@ -4,7 +4,7 @@
 HOMEPAGE = "http://openbsc.gnumonks.org"
 LICENSE = "GPL"
 
-INC_PR="r2"
+INC_PR="r2.${META_TELEPHONY_OSMO_INC}"
 
 LIC_FILES_CHKSUM = "file://COPYING;md5=73f1eb20517c55bf9493b7dd6e480788"
 
diff --git a/recipes-osmocom/libosmo-sccp/libosmo-sccp.inc b/recipes-osmocom/libosmo-sccp/libosmo-sccp.inc
index 6c9d8e2..0a8e663 100644
--- a/recipes-osmocom/libosmo-sccp/libosmo-sccp.inc
+++ b/recipes-osmocom/libosmo-sccp/libosmo-sccp.inc
@@ -3,7 +3,7 @@
 HOMEPAGE = "http://openbsc.gnumonks.org"
 LICENSE = "GPL"
 
-INC_PR="r1"
+INC_PR="r1.${META_TELEPHONY_OSMO_INC}"
 
 LIC_FILES_CHKSUM = "file://COPYING;md5=751419260aa954499f7abaabaa882bbe"
 
diff --git a/recipes-osmocom/libosmocore/libosmocore.inc b/recipes-osmocom/libosmocore/libosmocore.inc
index 16b4882..6e091ef 100644
--- a/recipes-osmocom/libosmocore/libosmocore.inc
+++ b/recipes-osmocom/libosmocore/libosmocore.inc
@@ -2,7 +2,7 @@
 HOMEPAGE = "http://openbsc.gnumonks.org"
 LICENSE = "GPL"
 
-INC_PR="r1"
+INC_PR="r1.${META_TELEPHONY_OSMO_INC}"
 
 LIC_FILES_CHKSUM = "file://COPYING;md5=751419260aa954499f7abaabaa882bbe"
 
diff --git a/recipes-osmocom/openbsc/openbsc.inc b/recipes-osmocom/openbsc/openbsc.inc
index 44b0935..4fbb14b 100644
--- a/recipes-osmocom/openbsc/openbsc.inc
+++ b/recipes-osmocom/openbsc/openbsc.inc
@@ -9,7 +9,7 @@
 SRC_URI = "file://osmo-nitb.init \
 	   file://osmo-bsc_mgcp.init \
 	   file://osmo-bsc.init"
-INC_PR = "r11"
+INC_PR = "r11.${META_TELEPHONY_OSMO_INC}"
 
 
 EXTRA_OECONF += " --enable-nat --enable-osmo-bsc "