changed build to use .so files instead of .a files for linking library components

zest_cfi_runtime/SConscript64

 import os
 
 
-Import('env')
-myenv=env.Clone()
+myenv=Environment()
 myenv.Replace(SECURITY_TRANSFORMS_HOME=os.environ['SECURITY_TRANSFORMS_HOME'])
 myenv.Replace(ZEST_RUNTIME=os.environ['ZEST_RUNTIME'])