Removing absolute path in '.rustc' section

With rust 1.75 the absolute build path is embedding into '.rustc' section and which causes reproducibility issues. Detailed issue is here.
rust-lang#120825 (comment)

With this change the 'absolute path' changed back to '/rust/$hash' format.

Author: sundeep-kokkonda

compiler/rustc_session/src/session.rs

@@ -907,7 +907,7 @@ impl Session {
                 | CrateType::Rlib
                 | CrateType::Staticlib
                 | CrateType::Cdylib => continue,
-                CrateType::ProcMacro => return false,
+                CrateType::ProcMacro => return true,
             }
         }