gnu: cmake-minimal: Remove ‘hidden’ property.

This makes ‘cmake-minimal’ accessible to users and additionally allows
for input rewriting, as discussed
at <https://issues.guix.gnu.org/65665#17>.

* gnu/packages/cmake.scm (cmake-minimal)[properties]: New field.

gnu/packages/cmake.scm

@@ -263,6 +263,7 @@ (define-public cmake-minimal
   (package
     (inherit cmake-bootstrap)
     (name "cmake-minimal")
+    (properties (alist-delete 'hidden? (package-properties cmake-bootstrap)))
     (source (origin
               (inherit (package-source cmake-bootstrap))
               ;; Purge CMakes bundled dependencies as they are no longer needed.