lua: Fix patch to not loose SYSCFLAGS

Not having SYSCFLAGS caused LUA_USE_LINUX to be lost, and io.popen
(and probably other things) was not enabled.

Fixes #552.

packages/lua/build.sh

@@ -1,7 +1,7 @@
 TERMUX_PKG_HOMEPAGE=http://www.lua.org/
 TERMUX_PKG_DESCRIPTION="Powerful, fast, lightweight, embeddable scripting language"
 TERMUX_PKG_VERSION=5.3.3
-TERMUX_PKG_BUILD_REVISION=2
+TERMUX_PKG_BUILD_REVISION=3
 TERMUX_PKG_SRCURL=http://www.lua.org/ftp/lua-${TERMUX_PKG_VERSION}.tar.gz
 TERMUX_PKG_DEPENDS="readline"
 TERMUX_PKG_EXTRA_MAKE_ARGS=linux

packages/lua/src-Makefile.patch

@@ -1,12 +1,13 @@
 diff -u -r ../lua-5.3.0/src/Makefile ./src/Makefile
 --- ../lua-5.3.0/src/Makefile	2015-01-05 11:04:52.000000000 -0500
 +++ ./src/Makefile	2015-05-24 18:06:15.958404755 -0400
-@@ -6,13 +6,7 @@
+@@ -6,13 +6,8 @@
  # Your platform. See PLATS for possible values.
  PLAT= none
  
 -CC= gcc -std=gnu99
 -CFLAGS= -O2 -Wall -Wextra -DLUA_COMPAT_5_2 $(SYSCFLAGS) $(MYCFLAGS)
++CFLAGS+= $(SYSCFLAGS)
 -LDFLAGS= $(SYSLDFLAGS) $(MYLDFLAGS)
  LIBS= -lm $(SYSLIBS) $(MYLIBS)
 -