Clean up build scripts a bit

SConstruct

@@ -2,9 +2,6 @@
 import os
 import sys
 
-import project_config
-
-constant_prefix = project_config.get_defines_friendly_name()
 
 env = SConscript("godot-cpp/SConstruct")
 
@@ -21,12 +18,11 @@ env.Append(CPPPATH=["src/"])
 
 # Context-specific define for GDExtension
 env.Append(CPPDEFINES=["GD_EXTENSION_BUILD"])
-env.Append(CPPDEFINES=[f"{constant_prefix}_GDEXTENSION"])
 sources = Glob("src/*.cpp")
 
 if env["platform"] == "macos":
     library = env.SharedLibrary(
-        "demo/bin/{}.{}.{}.framework/libgdexample.{}.{}".format(
+        "demo/bin/{}.{}.{}.framework/{}.{}.{}".format(
             project_config.lib_name(),
             env["platform"],
             env["target"],