package/ngrep: relace '_' by '.' in version

In order for the ngrep version to match what is given by
release-monitoring.org, replace '_' by '.' in NGREP_VERSION

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/ngrep/ngrep.hash

@@ -1,3 +1,3 @@
 # Locally computed:
-sha256  dc4dbe20991cc36bac5e97e99475e2a1522fd88c59ee2e08f813432c04c5fff3  ngrep-1_47.tar.gz
+sha256  dc4dbe20991cc36bac5e97e99475e2a1522fd88c59ee2e08f813432c04c5fff3  ngrep-1.47.tar.gz
 sha256  d46e593e048e0b9fc803561ed4c283f37a2d5447e4dcfa10cad29b394c2b8b9e  LICENSE

package/ngrep/ngrep.mk

@@ -4,8 +4,8 @@
 #
 ################################################################################
 
-NGREP_VERSION = 1_47
-NGREP_SITE = $(call github,jpr5,ngrep,V$(NGREP_VERSION))
+NGREP_VERSION = 1.47
+NGREP_SITE = $(call github,jpr5,ngrep,$(subst .,_,V$(NGREP_VERSION)))
 NGREP_LICENSE = BSD-4-Clause-like, BSD-3-Clause (tcpkill)
 NGREP_LICENSE_FILES = LICENSE
 NGREP_INSTALL_STAGING = YES