Rewrote crt0, init, and chainloading code

start.s, init.c, linker.ld and linker.specs are meant
to be re-used by user applications, should they remove the defines
from init.c and the .chainloader* sections from the linker script

fusee/fusee-primary/Makefile

@@ -27,7 +27,8 @@ CFLAGS = \
 	-std=gnu11 \
 	-Werror \
 	-Wall \
-	-fstrict-volatile-bitfields
+	-fstrict-volatile-bitfields \
+	-DFUSEE_STAGE1_SRC
 
 LDFLAGS = -specs=linker.specs -g $(ARCH)