Avoid compiling the C extension on win32 (still doesnt actually work …

…due to missing fork())

ext/extconf.rb

@@ -3,4 +3,9 @@
 # warnings save lives
 $CFLAGS << " -Wall "
 
-create_makefile('posix_spawn_ext')
+if RUBY_PLATFORM =~ /(mswin|mingw|bccwin)/
+  File.open('Makefile','w'){|f| f.puts "default: \ninstall: " }
+else
+  create_makefile('posix_spawn_ext')
+end
+

lib/posix/spawn.rb

@@ -1,4 +1,7 @@
-require 'posix_spawn_ext'
+unless RUBY_PLATFORM =~ /(mswin|mingw|bccwin)/
+  require 'posix_spawn_ext'
+end
+
 require 'posix/spawn/version'
 require 'posix/spawn/child'