Creating weak symbols doesn't work correctly when building an aout libc.

Doing the "right thing" here is difficult, so create two ENTRY points for
each function (for example, __setjmp and setjmp are equivalent).  This
isn't pretty, but it works for both aout and ELF.

libc symbol naming needs an overhaul in order to properly support function
wrapping, specifically in the case of a real libpthread, and these
duplicate entry points should be fixed as part of that overhaul.

Pointed out by:	bde

lib/libc/amd64/gen/setjmp.S

@@ -55,8 +55,7 @@
 #include "SYS.h"
 
 ENTRY(__setjmp)
-.weak setjmp;
-.set setjmp, __setjmp;
+ENTRY(setjmp)
 	movl	4(%esp),%ecx
 	PIC_PROLOGUE
 	leal	28(%ecx), %eax
@@ -83,8 +82,7 @@ ENTRY(__setjmp)
 	ret
 
 ENTRY(__longjmp)
-.weak longjmp;
-.set longjmp, __longjmp;
+ENTRY(longjmp)
 	movl	4(%esp),%edx
 	PIC_PROLOGUE
 	pushl	$0			/* (sigset_t*)oset */

lib/libc/amd64/gen/sigsetjmp.S

@@ -60,8 +60,7 @@
  */
 
 ENTRY(__sigsetjmp)
-.weak sigsetjmp;
-.set sigsetjmp, __sigsetjmp;
+ENTRY(sigsetjmp)
 	movl	8(%esp),%eax
 	movl	4(%esp),%ecx
 	movl	%eax,44(%ecx)
@@ -92,8 +91,7 @@ ENTRY(__sigsetjmp)
 	ret
 
 ENTRY(__siglongjmp)
-.weak siglongjmp;
-.set siglongjmp, __siglongjmp;
+ENTRY(siglongjmp)
 	movl	4(%esp),%edx
 	cmpl	$0,44(%edx)
 	jz	2f

lib/libc/i386/gen/setjmp.S

@@ -55,8 +55,7 @@
 #include "SYS.h"
 
 ENTRY(__setjmp)
-.weak setjmp;
-.set setjmp, __setjmp;
+ENTRY(setjmp)
 	movl	4(%esp),%ecx
 	PIC_PROLOGUE
 	leal	28(%ecx), %eax
@@ -83,8 +82,7 @@ ENTRY(__setjmp)
 	ret
 
 ENTRY(__longjmp)
-.weak longjmp;
-.set longjmp, __longjmp;
+ENTRY(longjmp)
 	movl	4(%esp),%edx
 	PIC_PROLOGUE
 	pushl	$0			/* (sigset_t*)oset */

lib/libc/i386/gen/sigsetjmp.S

@@ -60,8 +60,7 @@
  */
 
 ENTRY(__sigsetjmp)
-.weak sigsetjmp;
-.set sigsetjmp, __sigsetjmp;
+ENTRY(sigsetjmp)
 	movl	8(%esp),%eax
 	movl	4(%esp),%ecx
 	movl	%eax,44(%ecx)
@@ -92,8 +91,7 @@ ENTRY(__sigsetjmp)
 	ret
 
 ENTRY(__siglongjmp)
-.weak siglongjmp;
-.set siglongjmp, __siglongjmp;
+ENTRY(siglongjmp)
 	movl	4(%esp),%edx
 	cmpl	$0,44(%edx)
 	jz	2f