reallocate library, libraryobj: 50 isn't nearly enough

R=rsc
DELTA=7  (2 added, 0 deleted, 5 changed)
OCL=35569
CL=35569

src/cmd/ld/lib.c

@@ -153,9 +153,10 @@ addlib(char *src, char *obj)
 	for(i=0; i<libraryp; i++)
 		if(strcmp(name, library[i]) == 0)
 			return;
-	if(libraryp == nelem(library)){
-		diag("too many autolibs; skipping %s", name);
-		return;
+	if(libraryp == nlibrary){
+		nlibrary = 50 + 2*libraryp;
+		library = realloc(library, sizeof library[0] * nlibrary);
+		libraryobj = realloc(libraryobj, sizeof libraryobj[0] * nlibrary);
 	}
 
 	p = mal(strlen(name) + 1);

src/cmd/ld/lib.h

@@ -36,9 +36,10 @@ extern	int	cout;
 EXTERN	char*	INITENTRY;
 EXTERN	char	thechar;
 EXTERN	char*	thestring;
-EXTERN	char*	library[50];
-EXTERN	char*	libraryobj[50];
+EXTERN	char**	library;
+EXTERN	char**	libraryobj;
 EXTERN	int	libraryp;
+EXTERN	int	nlibrary;
 EXTERN	Sym*	hash[NHASH];
 EXTERN	Sym*	histfrog[MAXHIST];
 EXTERN	uchar	fnuxi8[8];