treewide: add missing BUILDONLY

Fixes Makefile warnings:

WARNING: skipping X -- package has no install section

Signed-off-by: Rosen Penev <rosenp@gmail.com>

libs/libcups/Makefile

@@ -33,6 +33,7 @@ $(call Package/cups/Default)
   CATEGORY:=Libraries
   DEPENDS:=+zlib +libpthread +libpng +libjpeg +libusb-1.0
   TITLE:=Common UNIX Printing System - Core library
+  BUILDONLY:=1
 endef
 
 define Package/libcups/description

libs/libevhtp/Makefile

@@ -38,6 +38,7 @@ define Package/libevhtp
     CATEGORY:=Libraries
     TITLE:=A more flexible replacement for libevent's httpd API
     URL:=https://github.com/criticalstack/libevhtp
+    BUILDONLY:=1
 endef
 
 define Package/libevhtp/description

libs/libowfat/Makefile

@@ -28,6 +28,7 @@ define Package/libowfat
   CATEGORY:=Libraries
   TITLE:=reimplemented libdjb under GPL
   URL:=https://www.fefe.de/libowfat/
+  BUILDONLY:=1
 endef
 
 define Build/Configure

libs/libtorrent/Makefile

@@ -31,6 +31,7 @@ define Package/libtorrent
   TITLE:=Rakshasa's BitTorrent library
   URL:=https://rakshasa.github.io/rtorrent/
   DEPENDS:=+libopenssl +libstdcpp +zlib
+  BUILDONLY:=1
 endef
 
 define Package/libtorrent/description

libs/nacl/Makefile

@@ -27,6 +27,7 @@ define Package/nacl
   CATEGORY:=Libraries
   TITLE:=NaCl Networking and Cryptography library
   URL:=http://nacl.cace-project.eu/
+  BUILDONLY:=1
 endef
 
 define Build/Compile

libs/redis/Makefile

@@ -54,6 +54,7 @@ define Package/redis-full
 $(call  Package/redis/Default)
   TITLE:=All Redis binaries (server,cli and utils)
   DEPENDS:=+redis-utils +redis-cli
+  BUILDONLY:=1
 endef
 
 define Package/redis-full/description

libs/spice-protocol/Makefile

@@ -29,6 +29,7 @@ define Package/spice-protocol
   CATEGORY:=Libraries
   TITLE:=SPICE - headers defining protocols
   URL:=https://www.spice-space.org/index.html
+  BUILDONLY:=1
 endef
 
 define Build/InstallDev

net/lksctp-tools/Makefile

@@ -45,6 +45,7 @@ define Package/sctp
 $(call Package/lksctp-tools/Default)
   TITLE+= (meta)
   DEPENDS:=+libsctp +sctp-tools
+  BUILDONLY:=1
 endef
 
 define Package/sctp-tools

net/net-snmp/Makefile

@@ -100,6 +100,7 @@ define Package/snmpd-static
 $(call Package/net-snmp/Default)
   DEPENDS:=+snmpd
   TITLE:=Open source SNMP implementation (daemon)
+  BUILDONLY:=1
 endef
 
 

utils/sane-backends/Makefile

@@ -43,6 +43,7 @@ $(call Package/sane-backends/Default)
   CATEGORY:=Utilities
   TITLE+= (drivers)
   DEPENDS:=+ALL:sane-backends-all
+  BUILDONLY:=1
 endef
 
 define Package/sane-backends/description