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[ld] Remove the double linked list for sections

It doesn't add anything and the work can be done in a simpler
way using a single linked list.

--- a/src/cmd/ld/section.c

+++ b/src/cmd/ld/section.c

@@ -20,11 +20,11 @@

 	Section sec;

 	FILE *tmpfp;

 	struct sectab *hash;

-	struct sectab *next, *prev;

+	struct sectab *next;

 };

 static struct sectab *sectab[NR_SECTION];

-static struct sectab secs = {.next = &secs, .prev = &secs};

+static struct sectab *secs;

 Section *

 lookupsec(char *name)

@@ -60,12 +60,9 @@

 	sp->tmpfp = NULL;

 	sp->hash = sectab[h];

 	sectab[h] = sp;

+	sp->next = secs;

+	secs = sp;

-	sp->next = &secs;

-	sp->prev = secs.prev;

-	secs.prev->next = sp;

-	secs.prev = sp;

-

 	return sec;

 }

@@ -76,7 +73,7 @@

 	Section *sec, **p;

 	int n = 0;

-	for (sp = secs.next; sp != &secs; sp = sp->next) {

+	for (sp = secs; sp; sp = sp->next) {

 		sec = &sp->sec;

 		if (sec->type != seg->type)

 			continue;