wxmac: disable monolithic build

More software requires non-monolithic builds than the
other way around

Closes Homebrew/homebrew#26624.

Formula/wxmac.rb

@@ -18,7 +18,6 @@ class Wxmac < Formula
   url 'http://downloads.sourceforge.net/project/wxpython/wxPython/3.0.0.0/wxPython-src-3.0.0.0.tar.bz2'
   sha1 '48451763275cfe4e5bbec49ccd75bc9652cba719'
 
-  option 'disable-monolithic', "Build a non-monolithic library (split into multiple files)"
   depends_on :python => :recommended
   depends_on FrameworkPython if build.with? "python"
 
@@ -58,8 +57,9 @@ class Wxmac < Formula
 
   def install
     # need to set with-macosx-version-min to avoid configure defaulting to 10.5
-    # need to enable universal binary build in order to build all x86_64 headers
-    # need to specify x86_64 and i386 or will try to build for ppc arch and fail on newer OSes
+    # need to enable universal binary build in order to build all x86_64
+    # headers need to specify x86_64 and i386 or will try to build for ppc arch
+    # and fail on newer OSes
     # https://trac.macports.org/browser/trunk/dports/graphics/wxWidgets30/Portfile#L80
     ENV.universal_binary
     args = [
@@ -91,9 +91,10 @@ class Wxmac < Formula
       "--with-macosx-version-min=#{MacOS.version}",
       "--with-macosx-sdk=#{MacOS.sdk_path}",
       "--enable-universal_binary=#{Hardware::CPU.universal_archs.join(',')}",
-      "--disable-precomp-headers"
+      "--disable-precomp-headers",
+      # This is the default option, but be explicit
+      "--disable-monolithic"
     ]
-    args << "--enable-monolithic" unless build.include? 'disable-monolithic'
 
     system "./configure", *args
     system "make install"