component/trafficserver: fix LuaJIT integration

Fixes 50f6a557 (component/trafficserver: build Lua plugin., 2021-11-23)
LuaJIT has to be build as shared to be referenced by trafficserver
component, because the later is already build as shared.
Also fix a missing rpath

component/luajit/buildout.cfg

@@ -6,10 +6,11 @@ parts = luajit
 
 [luajit]
 recipe = slapos.recipe.cmmi
+shared = true
 url = https://luajit.org/download/LuaJIT-2.0.5.tar.gz
 md5sum = 48353202cbcacab84ee41a5a70ea0a2c
 configure-command = true
 # pass dummy LDCONFIG to skip needless calling of ldconfig by non-root user
 make-options =
-  DPREFIX=${buildout:parts-directory}/${:_buildout_section_name_}
+  DPREFIX=@@LOCATION@@
   LDCONFIG=/bin/echo

component/trafficserver/buildout.cfg

@@ -42,7 +42,7 @@ configure-options =
   --disable-posix-cap
 environment =
   PATH=${libtool:location}/bin:${make:location}/bin:${patch:location}/bin:${perl:location}/bin:${pkgconfig:location}/bin:%(PATH)s
-  LDFLAGS =-L${openssl:location}/lib -Wl,-rpath=${openssl:location}/lib -L${tcl:location}/lib -Wl,-rpath=${tcl:location}/lib -L${zlib:location}/lib -Wl,-rpath=${zlib:location}/lib -lm
+  LDFLAGS =-L${openssl:location}/lib -Wl,-rpath=${openssl:location}/lib -L${tcl:location}/lib -Wl,-rpath=${tcl:location}/lib -L${zlib:location}/lib -Wl,-rpath=${zlib:location}/lib -Wl,-rpath=${luajit:location}/lib  -lm
 
 make-target =
   check