Merge branch 'tb/precompose-prefix-simplify'

Streamline the codepath to fix the UTF-8 encoding issues in the
argv[] and the prefix on macOS.

* tb/precompose-prefix-simplify:
  macOS: precompose startup_info->prefix
  precompose_utf8: make precompose_string_if_needed() public

git-compat-util.h

@@ -256,6 +256,11 @@ static inline const char *precompose_argv_prefix(int argc, const char **argv, co
 {
 	return prefix;
 }
+static inline const char *precompose_string_if_needed(const char *in)
+{
+	return in;
+}
+
 #define probe_utf8_pathname_composition()
 #endif