package/luvi: don't use LUAJIT_VERSION for the luajit installation path

Luajit package has been recently updated to the latest commit in the
master branch [1]. Since then LUAJIT_VERSION doesn't contain the luajit
version anymore but a commit hash:

LUAJIT_VERSION = 05f1984e1a862e4b3d3c3b370c773492e2edf84a

Use pkg-config --variable=version luajit in luvi package to set
LUA_PATH correctly.

Fixes:
luajit: unknown luaJIT command or jit.* modules not installed

https://gitlab.com/buildroot.org/buildroot/-/jobs/1710552605

[1] 9450b53c8e06f1b5a75840b82c0f4663a5d75c45

Signed-off-by: Romain Naour <romain.naour@gmail.com>
Cc: Jörg Krause <joerg.krause@embedded.rocks>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/luvi/luvi.mk

@@ -9,7 +9,7 @@ LUVI_SOURCE = luvi-src-v$(LUVI_VERSION).tar.gz
 LUVI_SITE = https://github.com/luvit/luvi/releases/download/v$(LUVI_VERSION)
 LUVI_LICENSE = Apache-2.0
 LUVI_LICENSE_FILES = LICENSE.txt
-LUVI_DEPENDENCIES = libuv luajit luv host-luajit
+LUVI_DEPENDENCIES = libuv luajit luv host-luajit host-pkgconf
 
 # Dispatch all architectures of LuaJIT
 ifeq ($(BR2_i386),y)
@@ -30,12 +30,16 @@ else
 LUVI_TARGET_ARCH = $(BR2_ARCH)
 endif
 
+# LUAJIT_VERSION and the luajit installation path may not use the
+# same value. Use the value from luajit.pc file.
+LUVI_LUAJIT_VERSION = `$(PKG_CONFIG_HOST_BINARY) --variable=version luajit`
+
 # Bundled lua bindings have to be linked statically into the luvi executable
 LUVI_CONF_OPTS = \
 	-DBUILD_SHARED_LIBS=OFF \
 	-DWithSharedLibluv=ON \
 	-DTARGET_ARCH=$(LUVI_TARGET_ARCH) \
-	-DLUA_PATH=$(HOST_DIR)/share/luajit-$(LUAJIT_VERSION)/?.lua
+	-DLUA_PATH=$(HOST_DIR)/share/luajit-$(LUVI_LUAJIT_VERSION)/?.lua
 
 # Add "rex" module (PCRE via bundled lrexlib)
 ifeq ($(BR2_PACKAGE_PCRE),y)