[iQue] Match remaining src/boot files (#2417)

* [iQue] Match remaining src/boot files

* Fix debug ROM

* Use -funsigned-char

* Sort ique before gc in LNx macros

src/boot/is_debug_ique.c

@@ -0,0 +1,8 @@
+void osSyncPrintfUnused() {
+}
+
+void osSyncPrintf() {
+}
+
+void rmonPrintf() {
+}