Add/fix help string for version option

osmo-sgsn was missing the help text of the -V option
gb_proxy still thought of itself as OpenBSC
Omit the name of the program in the help text to avoid such issues in
the future.

Related: OS#1720
Change-Id: Ib57694b6bff7c98a269dc4b4dbb7173349a57b81
diff --git a/src/gprs/gb_proxy_main.c b/src/gprs/gb_proxy_main.c
index 19fbbba..1e1aeac 100644
--- a/src/gprs/gb_proxy_main.c
+++ b/src/gprs/gb_proxy_main.c
@@ -140,7 +140,7 @@
 	printf("  -c --config-file filename The config file to use [%s]\n", CONFIG_FILE_DEFAULT);
 	printf("  -s --disable-color\n");
 	printf("  -T --timestamp Prefix every log line with a timestamp\n");
-	printf("  -V --version. Print the version of OpenBSC.\n");
+	printf("  -V --version. Print the version.\n");
 	printf("  -e --log-level number. Set a global loglevel.\n");
 }