lua: fix build and update to lua5.3

Fixes #8360

.gitlab-ci.yml

@@ -6,7 +6,7 @@ test:alpine:
     stage: test
     script:
         - apk update
-        - apk add make gcc git musl-dev openssl-dev linux-headers zlib-dev lua5.2-dev
+        - apk add make gcc git musl-dev openssl-dev linux-headers zlib-dev lua5.3-dev
         - make -j$(nproc) check
     tags:
         - docker-alpine
@@ -16,7 +16,7 @@ test:debian:
     stage: test
     script:
         - apt-get update
-        - apt-get install -y make gcc git libssl-dev zlib1g-dev lua5.2-dev sudo
+        - apt-get install -y make gcc git libssl-dev zlib1g-dev lua5.3-dev sudo
         - unlink /bin/sh
         - ln -s /bin/bash /bin/sh
         - make -j$(nproc) check

.travis.yml

@@ -15,7 +15,7 @@ before_install:
   - alpine() { /alpine/enter-chroot -u "$USER" "$@"; }
 install:
   - sudo sh alpine-chroot-install -a "$ARCH" -b v3.10
-        -p 'build-base alpine-sdk linux-headers lua5.2-dev openssl openssl-dev zlib-dev'
+        -p 'build-base alpine-sdk linux-headers lua5.3-dev openssl openssl-dev zlib-dev'
 before_script:
   - /alpine/enter-chroot sh -c "addgroup $USER wheel && addgroup $USER abuild"
   - alpine abuild-keygen -ain

src/Makefile

@@ -9,7 +9,7 @@ ZLIB_LIBS		:= $(shell $(PKG_CONFIG) --libs zlib)
 
 # lua module
 ifneq ($(LUAAPK),)
-LUA_VERSION		?= 5.2
+LUA_VERSION		?= 5.3
 LUA_PC			?= lua$(LUA_VERSION)
 LUA_LIBDIR		?= /usr/lib/lua/$(LUA_VERSION)
 LIBAPK			:= YesPlease

src/lua-apk.c

@@ -46,6 +46,11 @@ static int typerror (lua_State *L, int narg, const char *tname) {
 	return luaL_argerror(L, narg, msg);
 }
 
+time_t apk_time(void)
+{
+	return time(NULL);
+}
+
 static apk_blob_t check_blob(lua_State *L, int index)
 {
 	apk_blob_t blob;