Restore PATH_list for CSL_jll, etc. (#57819)

See https://github.com/JuliaLang/julia/pull/57719/files#r2001612202

Author: topolarity

stdlib/CompilerSupportLibraries_jll/src/CompilerSupportLibraries_jll.jl

@@ -8,6 +8,8 @@ using Base, Libdl, Base.BinaryPlatforms
 export libgfortran, libstdcxx, libgomp, libatomic, libgcc_s
 
 # These get calculated in __init__()
+const PATH = Ref("")
+const PATH_list = String[]
 const LIBPATH = Ref("")
 const LIBPATH_list = String[]
 artifact_dir::String = ""

stdlib/OpenBLAS_jll/src/OpenBLAS_jll.jl

@@ -5,12 +5,11 @@ baremodule OpenBLAS_jll
 using Base, Libdl, Base.BinaryPlatforms
 using CompilerSupportLibraries_jll
 
-const PATH_list = String[]
-const LIBPATH_list = String[]
-
 export libopenblas
 
 # These get calculated in __init__()
+const PATH = Ref("")
+const PATH_list = String[]
 const LIBPATH = Ref("")
 const LIBPATH_list = String[]
 artifact_dir::String = ""

stdlib/libblastrampoline_jll/src/libblastrampoline_jll.jl

@@ -8,6 +8,8 @@ using Base, Libdl
 export libblastrampoline
 
 # These get calculated in __init__()
+const PATH = Ref("")
+const PATH_list = String[]
 const LIBPATH = Ref("")
 const LIBPATH_list = String[]
 artifact_dir::String = ""