gforth: libtool is a runtime dep

Formula/gforth.rb

@@ -5,7 +5,7 @@ class Gforth < Formula
   url 'http://www.complang.tuwien.ac.at/forth/gforth/gforth-0.7.2.tar.gz'
   sha256 '77db9071c2442da3215da361b71190bccb153f81f4d01e5e8bc2c2cf8ee81b48'
 
-  depends_on :libtool
+  depends_on 'libtool' => :run
   depends_on 'libffi'
   depends_on 'pcre'
 
@@ -17,11 +17,7 @@ class Gforth < Formula
 
   def install
     ENV.deparallelize
-    args = %W[
-      --disable-debug
-      --disable-dependency-tracking
-      --prefix=#{prefix}
-    ]
+    args = %W[--prefix=#{prefix}]
 
     if MacOS.prefer_64_bit?
       args << "--build=x86_64-apple-darwin#{darwin_major_version}"