szip, hdf5, fann: add --universal

Closes Homebrew/homebrew#17237.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>

Formula/fann.rb

@@ -6,8 +6,10 @@ class Fann < Formula
   sha1 'ff8341e4104bdbc0f3ab7ad39aef33285f8512d4'
 
   depends_on 'cmake' => :build
+  option :universal
 
   def install
+    ENV.universal_binary if build.universal?
     system "cmake", ".", *std_cmake_args
     system "make install"
   end

Formula/hdf5.rb

@@ -8,10 +8,12 @@ class Hdf5 < Formula
   depends_on 'szip'
 
   # TODO - warn that these options conflict
+  option :universal
   option 'enable-fortran', 'Compile Fortran bindings'
   option 'enable-threadsafe', 'Trade performance and C++ or Fortran support for thread safety'
 
   def install
+    ENV.universal_binary if build.universal?
     args = %W[
       --prefix=#{prefix}
       --enable-production

Formula/szip.rb

@@ -5,7 +5,10 @@ class Szip < Formula
   homepage 'http://www.hdfgroup.org/HDF5/release/obtain5.html#extlibs'
   sha1 'd241c9acc26426a831765d660b683b853b83c131'
 
+  option :universal
+
   def install
+    ENV.universal_binary if build.universal?
     system "./configure", "--prefix=#{prefix}", "--disable-debug", "--disable-dependency-tracking"
     system "make install"
   end