Fix conditional compilation in libiconv work-arounds.

git-svn-id: https://svn.r-project.org/R/trunk@87212 00db46b3-68df-0310-9c12-caf00c1e9a41

src/main/sysutils.c

@@ -1262,6 +1262,9 @@ static int fails_iteratively_with_bom(void)
 	return -1;
     return 0;
 }
+#endif
+
+#ifdef R_MACOS_LIBICONV_RESET_AFTER_ERROR
 
 /* Test whether iconv, after encountering an invalid byte in input, keeps
    incorrectly reporting as invalid also additional valid bytes. This has