Change CBool to be 1 byte.

lib/std/core/cinterop.c3

@@ -29,7 +29,7 @@ def CUChar = char;
 
 def CChar = $typefrom($$C_CHAR_IS_SIGNED ? ichar.typeid : char.typeid);
 
-enum CBool : CInt
+enum CBool : char
 {
 	FALSE,
 	TRUE

releasenotes.md

@@ -30,6 +30,7 @@
 - Use `weak` on dyn-symbols on Linux.
 - Fix crash on project.json not having an empty set of targets.
 - Miscompile when indexing an array with small unsigned types for enums.
+- Change CBool to be 1 byte.
 
 ### Stdlib changes
 - Increase BitWriter.write_bits limit up to 32 bits.