capstone: directory install fix

Deals with the issues seen in Homebrew/homebrew#34316. Forces a recompile as well, since
anyone who has this package installed from bottle has only text files
in the Cellar, and anyone who has the package installed from source has
/usr/local full of stuff that shouldn’t be directly there.

Closes Homebrew/homebrew#34609.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>

Formula/capstone.rb

@@ -1,9 +1,10 @@
-require 'formula'
+require "formula"
 
 class Capstone < Formula
-  homepage 'http://capstone-engine.org'
-  url 'http://capstone-engine.org/download/3.0/capstone-3.0.tgz'
-  sha1 '26e591b8323ed3f6e92637d7ee953cb505687efa'
+  homepage "http://capstone-engine.org"
+  url "http://capstone-engine.org/download/3.0/capstone-3.0.tgz"
+  sha1 "26e591b8323ed3f6e92637d7ee953cb505687efa"
+  revision 1
 
   bottle do
     cellar :any
@@ -13,9 +14,18 @@ class Capstone < Formula
   end
 
   def install
-    ENV["PREFIX"] = prefix
+    # Capstone's Make script ignores the prefix env and was installing
+    # in /usr/local directly. So just inreplace the prefix for less pain.
+    # https://github.com/aquynh/capstone/issues/228
+    inreplace "make.sh", "export PREFIX=/usr/local", "export PREFIX=#{prefix}"
+
     ENV["HOMEBREW_CAPSTONE"] = "1"
     system "./make.sh"
     system "./make.sh", "install"
   end
+
+  test do
+    # Given the build issues around prefix, check is actually in the Cellar.
+    assert File.exist? "#{lib}/libcapstone.a"
+  end
 end