package: unification of use $(subst [._-], [._-], $(<PKG>_VERSION)) macro

Currently, there are five packages which use 'subst' macro to change their version.

* Three of them (ebtables, icu, perl) use this macro "in place" :

   EBTABLES_SITE = http://downloads.sourceforge.net/project/ebtables/ebtables/ebtables-$(subst .,-,$(EBTABLES_VERSION))

   ICU_SOURCE = icu4c-$(subst .,_,$(ICU_VERSION))-src.tgz

   PERL_CROSS_OLD_POD = perl$(subst .,,$(PERL_CROSS_BASE_VERSION))delta.pod
   PERL_CROSS_NEW_POD = perl$(subst .,,$(PERL_VERSION))delta.pod

* Two of them (boost, libnss) use an additional variable :

   BOOST_FILE_VERSION = $(subst .,_,$(BOOST_VERSION))
   BOOST_SOURCE = boost_$(BOOST_FILE_VERSION).tar.bz2

   LIBNSS_SITE_VERSION = $(subst .,_,$(LIBNSS_VERSION))
   LIBNSS_SITE = https://ftp.mozilla.org/pub/mozilla.org/security/nss/releases/NSS_$(LIBNSS_SITE_VERSION)_RTM/src

* Additionally two packages (duma, rings) doesn't use it at all :

   DUMA_VERSION = 2_5_15
   DUMA_SITE = http://downloads.sourceforge.net/project/duma/duma/2.5.15

   RINGS_VERSION_MAJOR = 1.3.0
   RINGS_SUBDIR  = rings-v_1_3_0

This commit makes changes to use 'subst' macro "in place", in all of them.

Signed-off-by: Jerzy Grzegorek <jerzy.grzegorek@trzebnica.net>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
luarocks: use -fPIC for shared library

Fixes:
http://autobuild.buildroot.net/results/f28a624f89f4de249a1b7a718f5ae31109ba9171/
http://autobuild.buildroot.net/results/1ead0a162a251d3e7bf8598036fa06c4befeb3d9/
http://autobuild.buildroot.net/results/0544cead086ba51b45dfa1df114787a8f22eaf8d/
http://autobuild.buildroot.net/results/60161d13d596d41dd4059977eb947d72c172f0d5/
http://autobuild.buildroot.net/results/e7e/e7ea6946552f72dc27f23ae1aff1665a6aa097c7/

[Peter: adjust commit message]
Signed-off-by: Francois Perrad <francois.perrad@gadz.org>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
luasocket: fix build with uClibc without IPv6

see http://autobuild.buildroot.net/results/698/6989e71bf50946d62b696dbe07e8f00679b6aad9/

Signed-off-by: Francois Perrad <francois.perrad@gadz.org>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
ljsyscall: new package

An FFI implementation of the Linux and NetBSD kernel ABIs for LuaJIT.

Signed-off-by: Danomi Manchego <danomimanchego123@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
lua: choice between 5.1.x & 5.2.x

Signed-off-by: Francois Perrad <francois.perrad@gadz.org>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
lua-modules: choice between Lua 5.1.x & Lua 5.2.x

Signed-off-by: Francois Perrad <francois.perrad@gadz.org>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
lua: add an upstream patch

from http://www.lua.org/bugs.html

Signed-off-by: Francois Perrad <francois.perrad@gadz.org>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>