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libmach: Add elf64str()

Elf64str() deals with all the cases to obtain a string related to
a section or to a symbol.

--- a/src/libmach/elf64/elf64.c

+++ b/src/libmach/elf64/elf64.c

@@ -19,3 +19,20 @@

 	.getsec = NULL,

 	.loadmap = NULL,

 };

+

+char *

+elf64str(Obj *obj, int n, long stroff)

+{

+	char *tbl;

+	size_t siz;

+	struct elf64 *elf;

+

+	elf = obj->data;

+

+	tbl = elf->strtbl[n];

+	siz = elf->strsiz[n];

+

+	if (!tbl || siz < stroff)

+		return "";

+	return &tbl[stroff];

+}

--- a/src/libmach/elf64/elf64.h

+++ b/src/libmach/elf64/elf64.h

@@ -51,3 +51,5 @@

 extern Symbol *elf64getsym(Obj *, int *, Symbol *);

 extern Section *elf64getsec(Obj *, int *, Section *);

 extern Map *elf64loadmap(Obj *, FILE *);

+

+extern char *elf64str(Obj *, int n, long);