emacs-oni-php: Install its scripts

I created a scripts directory for emacs-oni-php that contains a script written
in SCSH. So a) copy the scripts over to the build output, and b) install SCSH as
a dependency for emacs-oni-php.

oni/packages/emacs-config.scm

@@ -11,6 +11,8 @@
                 #:select (emacs-notmuch))
   #:use-module ((gnu packages python-xyz)
                 #:select (python-black))
+  #:use-module ((gnu packages shells)
+                #:select (scsh))
   #:use-module ((gnu packages tree-sitter)
                 #:select (tree-sitter-python))
   #:use-module (oni packages emacs))
@@ -932,7 +934,7 @@ Emacs")))
        (modify-phases %standard-phases
          (add-after 'unpack 'chdir-oni-php
            (λ _ (chdir "oni-php"))))
-       #:include '("\\.el$" "^snippets\\/")))
+       #:include '("\\.el$" "^snippets\\/" "^scripts\\/")))
     (propagated-inputs
      (list emacs-php-mode
            emacs-oni-yasnippet
@@ -943,7 +945,8 @@ Emacs")))
            emacs-fic-mode
            emacs-ac-php
            ;; Actually a dependency of emacs-ac-php for using company-php.
-           emacs-xcscope))
+           emacs-xcscope
+           scsh))
     (synopsis "My configuration for php-mode.")
     (description "This package provides my configuration for editing PHP files.")))