sparc64/*/bsp_specs, shared/.../start.S: Use GCC init/fini, improve consistency

Updates #3520.

c/src/lib/libbsp/sparc64/niagara/bsp_specs

@@ -4,12 +4,10 @@
 
 *startfile:
 %{!qrtems: %(old_startfile)} \
-%{!nostdlib: %{qrtems: start.o%s crtbegin.o%s -e _start}}
-
-*endfile:
-%{!qrtems: %(old_endfile)} \
-%{!nostdlib: %{qrtems: crtend.o%s}}
+%{!nostdlib: %{qrtems: start.o%s crti.o%s crtbegin.o%s -e _start}}
 
 *link:
-%(old_link) %{!qrtems: %(old_link)} %{qrtems: -dc -dp -N}
+%{!qrtems: %(old_link)} %{qrtems: -dc -dp -N}
 
+*endfile:
+%{!qrtems: %(old_endfile)} %{!nostdlib: %{qrtems: crtend.o%s crtn.o%s}}

c/src/lib/libbsp/sparc64/shared/start/start.S

@@ -149,17 +149,3 @@ halted:	nop
   .align CPU_ALIGNMENT
   param_space:
   	.space 8
-
-.section .fini
-  .global _fini
-  _fini:
-    nop
-    retl
-    nop
-
-.section .init
-  .global _init
-  _init:
-    nop
-    retl
-    nop

c/src/lib/libbsp/sparc64/usiii/bsp_specs

@@ -4,12 +4,10 @@
 
 *startfile:
 %{!qrtems: %(old_startfile)} \
-%{!nostdlib: %{qrtems: start.o%s crtbegin.o%s -e _start}}
-
-*endfile:
-%{!qrtems: %(old_endfile)} \
-%{!nostdlib: %{qrtems: crtend.o%s}}
+%{!nostdlib: %{qrtems: start.o%s crti.o%s crtbegin.o%s -e _start}}
 
 *link:
-%(old_link) %{!qrtems: %(old_link)} %{qrtems: -dc -dp -N}
+%{!qrtems: %(old_link)} %{qrtems: -dc -dp -N}
 
+*endfile:
+%{!qrtems: %(old_endfile)} %{!nostdlib: %{qrtems: crtend.o%s crtn.o%s}}