gh-90005: Rename MODULE_EGG variable to MODULE_EGG_STATE (GH-94301)

It makes it easier to look for module states in sysconfig without
special casing suffixes "_CFLAGS", "_DEPS", "_LDFLAGS", "_OBJS",
and "CTYPES_MALLOC_CLOSURE".

Author: tiran

Makefile.pre.in

@@ -222,7 +222,7 @@ OPENSSL_RPATH=@OPENSSL_RPATH@
 #   * missing: build dependency is missing
 #   * disabled: module is disabled
 #   * n/a: module is not available on the current platform
-# MODULE_EGG=yes  # yes, missing, disabled, n/a
+# MODULE_EGG_STATE=yes  # yes, missing, disabled, n/a
 # MODULE_EGG_CFLAGS=
 # MODULE_EGG_LDFLAGS=
 @MODULE_BLOCK@