Merge pull request #254 from larskanis/revert-dl

 Don't mandate dl functions for the extention build

Author: tenderlove

ext/sqlite3/extconf.rb

@@ -64,11 +64,7 @@ def asplode missing
 asplode('sqlite3.h')  unless find_header  'sqlite3.h'
 find_library 'pthread', 'pthread_create' # 1.8 support. *shrug*
 
-have_library 'dl'
-
-%w{ dlopen dlclose dlsym }.each do |func|
-  abort "missing function #{func}" unless have_func(func)
-end
+have_library 'dl' # for static builds
 
 if with_config('sqlcipher')
   asplode('sqlcipher') unless find_library 'sqlcipher', 'sqlite3_libversion_number'