Remove emoji to build without Unicode

Author: stefanv

advanced/interfacing_with_c/ctypes/cos_module.py

@@ -8,7 +8,7 @@
 from ctypes.util import find_library
 
 libm_name = find_library("m")
-assert libm_name is not None, "Cannot find libm (math) on this system 👀. That's bad."
+assert libm_name is not None, "Cannot find libm (math) on this system :/ That's bad."
 
 libm = ctypes.cdll.LoadLibrary(libm_name)