moxiesim: Simplify bsp_specs

Updates #3520.

c/src/lib/libbsp/moxie/moxiesim/bsp_specs

@@ -1,13 +1,9 @@
 %rename endfile old_endfile
 %rename startfile old_startfile
-%rename link old_link
 
 *startfile:
 %{!qrtems: %(old_startfile)} \
-%{!nostdlib: %{qrtems: start.o%s -e _start crtbegin.o%s}}
-
-*link:
-%{!qrtems: %(old_link)} %{qrtems: -dc -dp -N}
+%{!nostdlib: %{qrtems: crtbegin.o%s}}
 
 *endfile:
 %{!qrtems: %(old_endfile)} %{!nostdlib: %{qrtems: crtend.o%s}}

c/src/lib/libbsp/moxie/moxiesim/startup/linkcmds

@@ -18,6 +18,7 @@
 OUTPUT_FORMAT("elf32-bigmoxie")
 OUTPUT_ARCH(moxie)
 ENTRY(_start)
+STARTUP(start.o)
 
 RamBase = DEFINED(RamBase) ? RamBase : 0x00000000;
 RamSize = DEFINED(RamSize) ? RamSize : 16M;