example: Clean up assert handler example.

Ensure that we override any optimization and use debug level `Og`
so that the assert stack trace that was just fixed works as expected.

Additionally update the comments in the example to drop references to
the old frame pointers tracing and providing the modern way to use
$KOS_ADDR2LINE

Author: QuzarDC

examples/dreamcast/basic/asserthnd/Makefile

@@ -17,7 +17,7 @@ rm-elf:
 	-rm -f $(TARGET)
 
 $(TARGET): $(OBJS)
-	kos-cc -o $(TARGET) $(OBJS)
+	kos-cc -Og -o $(TARGET) $(OBJS)
 
 run: $(TARGET)
 	$(KOS_LOADER) $(TARGET)

examples/dreamcast/basic/asserthnd/asserthnd.c

@@ -12,26 +12,25 @@
 This example shows off how to setup an assert handler (for example for
 a custom crash screen, or some other debug method, or even ignoring
 asserts selectively). It also demonstrates the default assert handler.
-If you compiled with -DFRAME_POINTERS and without -fomit-frame-pointer
-then you'll get something like this:
+You'll get something like this:
 
 *** ASSERTION FAILURE ***
 Assertion "a != 5" failed at asserthnd.c:40 in `func2': This is a test message!
 
 -------- Stack Trace (innermost first) ---------
-   8c01016a
-   8c0101e0
-   8c010478
-   8c010062
+   8c010170
+   8c0101ca
+   8c0111f2
+   8c010086
 -------------- End Stack Trace -----------------
 
 You can punch those numbers into addr2line to get a nice stack traceback,
 assuming you compiled your program with -g:
 
->] dc-addr2line -e asserthnd.elf 8c01016a 8c0101e0 8c010478
-/usr/local/home/bard/prj/kos/examples/dreamcast/basic/asserthnd/asserthnd.c:46
-/usr/local/home/bard/prj/kos/examples/dreamcast/basic/asserthnd/asserthnd.c:69
-/usr/local/home/bard/prj/kos/kernel/arch/dreamcast/kernel/main.c:129
+>] $KOS_ADDR2LINE -e asserthnd.elf 8c010170 8c0101ca 8c0111f2
+/opt/toolchains/dc/kos/examples/dreamcast/basic/asserthnd/asserthnd.c:45 (discriminator 1)
+/opt/toolchains/dc/kos/examples/dreamcast/basic/asserthnd/asserthnd.c:73
+/opt/toolchains/dc/kos/kernel/arch/dreamcast/kernel/init.c:311
 
 */