Demos: Use long lumpname when handling staff ghost information

Implements new W_CheckLongNameForNum funcs, which are broadly copypasted from W_CheckNameForNum

src/k_credits.cpp

@@ -555,7 +555,6 @@ static boolean F_CreditsPlayDemo(void)
 
 	UINT8 ghost_id = M_RandomKey( mapheaderinfo[map_id]->ghostCount );
 	brief = mapheaderinfo[map_id]->ghostBrief[ghost_id];
-	std::string demo_name = static_cast<const char *>(W_CheckNameForNumPwad(brief->wad, brief->lump));
 
 	demo.attract = DEMO_ATTRACT_CREDITS;
 	demo.ignorefiles = true;

src/p_setup.cpp

@@ -7901,7 +7901,7 @@ static void P_LoadRecordGhosts(void)
 			savebuffer_t buf = {0};
 
 			staffbrief_t* ghostbrief = mapheaderinfo[gamemap-1]->ghostBrief[i - 1];
-			const char* lumpname = W_CheckNameForNumPwad(ghostbrief->wad, ghostbrief->lump);
+			const char* lumpname = W_CheckLongNameForNumPwad(ghostbrief->wad, ghostbrief->lump);
 			size_t lumplength = W_LumpLengthPwad(ghostbrief->wad, ghostbrief->lump);
 			if (lumplength == 0)
 			{

src/w_wad.cpp

@@ -1021,6 +1021,19 @@ const char *W_CheckNameForNum(lumpnum_t lumpnum)
 	return W_CheckNameForNumPwad(WADFILENUM(lumpnum),LUMPNUM(lumpnum));
 }
 
+const char *W_CheckLongNameForNumPwad(UINT16 wad, UINT16 lump)
+{
+	if (lump >= wadfiles[wad]->numlumps || !TestValidLump(wad, 0))
+		return NULL;
+
+	return wadfiles[wad]->lumpinfo[lump].longname;
+}
+
+const char *W_CheckLongNameForNum(lumpnum_t lumpnum)
+{
+	return W_CheckLongNameForNumPwad(WADFILENUM(lumpnum),LUMPNUM(lumpnum));
+}
+
 //
 // wadid is a wad number
 // (Used for sprites loading)

src/w_wad.h

@@ -154,6 +154,8 @@ INT32 W_InitMultipleFiles(char **filenames, boolean addons);
 
 const char *W_CheckNameForNumPwad(UINT16 wad, UINT16 lump);
 const char *W_CheckNameForNum(lumpnum_t lumpnum);
+const char *W_CheckLongNameForNumPwad(UINT16 wad, UINT16 lump);
+const char *W_CheckLongNameForNum(lumpnum_t lumpnum);
 
 UINT16 W_FindNextEmptyInPwad(UINT16 wad, UINT16 startlump); // checks only in one pwad