gen68340: Simplify bsp_specs

Updates #3520.

c/src/lib/libbsp/m68k/gen68340/bsp_specs

@@ -1,13 +1,10 @@
 %rename endfile old_endfile
 %rename startfile old_startfile
-%rename link old_link
 
 *startfile:
 %{!qrtems: %(old_startfile)} \
-%{!nostdlib: %{qrtems: start.o%s crti.o%s crtbegin.o%s -e start}}
-
-*link:
-%{!qrtems: %(old_link)} %{qrtems: -dc -dp -N}
+%{!nostdlib: %{qrtems: crti.o%s crtbegin.o%s}}
 
 *endfile:
 %{!qrtems: %(old_endfile)} %{qrtems: crtend.o%s crtn.o%s}
+

c/src/lib/libbsp/m68k/gen68340/startup/linkcmds

@@ -35,6 +35,9 @@ MEMORY {
 /*        dpram : ORIGIN = 0xFE000000, LENGTH = 8k */
 }
 
+ENTRY(start)
+STARTUP(start.o)
+
 /*
  * Declare low-order three octets of Ethernet address.
  */