use the correct path to include Compiler.jl in release builds (JuliaLang#56601)

JuliaLang#56409 broke PackageCompiler (or
other use cases where you want to compile a new core compiler from a
release build) since it hardcoded the relative path `../usr/` from Base
to the `shared` directory but this is not true in releases where it is
at `..`.

Author: KristofferC

src/Compiler.jl

@@ -87,14 +87,14 @@ eval(m, x) = Core.eval(m, x)
 function include(x::String)
     if !isdefined(Base, :end_base_include)
         # During bootstrap, all includes are relative to `base/`
-        x = Base.strcat(Base.strcat(Base.BUILDROOT, "../usr/share/julia/Compiler/src/"), x)
+        x = Base.strcat(Base.strcat(Base.DATAROOT, "julia/Compiler/src/"), x)
     end
     Base.include(Compiler, x)
 end
 
 function include(mod::Module, x::String)
     if !isdefined(Base, :end_base_include)
-        x = Base.strcat(Base.strcat(Base.BUILDROOT, "../usr/share/julia/Compiler/src/"), x)
+        x = Base.strcat(Base.strcat(Base.DATAROOT, "julia/Compiler/src/"), x)
     end
     Base.include(mod, x)
 end