Avoid allocating for our linkdef names (#2111)

This reverts a change introduced in fd78a9ae8, though it wasn't that commit's main point
so I'm feeling okay with undoing that.

This feels like an overkill change, using a static string is good enough for this
since we never modify this. I have considered using `string_view` instead, to have
the best of both worlds, but that's not NUL-terminated so our print functions
get a little grumpy.

src/link/output.cpp

@@ -461,7 +461,7 @@ static void writeMapBank(SortedSections const &sectList, SectionType type, uint3
 	fprintf(
 	    mapFile,
 	    "\n%s bank #%" PRIu32 ":\n",
-	    sectionTypeInfo[type].name.c_str(),
+	    sectionTypeInfo[type].name,
 	    bank + sectionTypeInfo[type].firstBank
 	);
 
@@ -524,7 +524,7 @@ static void writeMapSummary() {
 		fprintf(
 		    mapFile,
 		    "\t%s: %" PRIu32 " byte%s used / %zu free",
-		    sectionTypeInfo[type].name.c_str(),
+		    sectionTypeInfo[type].name,
 		    usedTotal,
 		    usedTotal == 1 ? "" : "s",
 		    static_cast<size_t>(nbBanks) * sectionTypeInfo[type].size - usedTotal