Update proj4 from 4.9.1 to 4.9.3

packages/proj4.rb

@@ -3,13 +3,13 @@ require 'package'
 class Proj4 < Package
   description 'proj.4 is a standard Unix filter function which converts geographic longitude and latitude coordinates into cartesian coordinates (and vice versa), and it is a C API for software developers to include coordinate transformation in their own software.'
   homepage 'http://proj4.org/'
-  version '4.9.1-1'
-  source_url 'http://download.osgeo.org/proj/proj-4.9.1.tar.gz'
-  source_sha256 'fca0388f3f8bc5a1a803d2f6ff30017532367992b30cf144f2d39be88f36c319'
+  version '4.9.3'
+  source_url 'http://download.osgeo.org/proj/proj-4.9.3.tar.gz'
+  source_sha256 '6984542fea333488de5c82eea58d699e4aff4b359200a9971537cd7e047185f7'
 
   def self.build
-    system "./configure CFLAGS=\" -fPIC\""
-    system "make"
+    system './configure CFLAGS=" -fPIC"'
+    system 'make'
   end
 
   def self.install