Add macos runtime resolve.

Author: travisdoor

lib/bl/api/builtin/entry/darwin/libentry.a

@@ -358,7 +358,6 @@ static bool arm64_apple_darwin(struct context *ctx) {
 	}
 
 	str_buf_append_fmt(&libpath, ":{str}/{str}", macos_sdk, cstr("usr/lib"));
-	str_buf_free(&macos_sdk);
 
 	str_buf_t osver = execute("sw_vers -productVersion");
 	if (osver.len == 0) {
@@ -392,8 +391,7 @@ static bool arm64_apple_darwin(struct context *ctx) {
 
 	// Resolve c runtime
 	str_buf_append_fmt(&optexec, "{str}/usr/lib/crt1.o ", macos_sdk);
-	str_buf_append_fmt(&optexec, "{str}/usr/lib/crti.o ", macos_sdk);
-	str_buf_append_fmt(&optexec, "{str}/usr/lib/crtn.o ", macos_sdk);
+	str_buf_free(&macos_sdk);
 
 	str_buf_append(&optexec, LINKER_OPT_EXEC);
 	str_buf_append(&optshared, LINKER_OPT_SHARED);