keys.c: disable -Warray-bounds warning from gcc >= 8. seems bogus.

In function 'Key_Console',
    inlined from 'Key_Event' at keys.c:1048:3:
keys.c:544:4: warning: 'memmove' offset [-2147483647, -1] is out of the bounds [0, 8192] of object 'key_lines' with type 'char[32][256]' [-Warray-bounds]
    memmove (workline + 1, workline, len);
    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
keys.c: In function 'Key_Event':
keys.c:25:6: note: 'key_lines' declared here
 char key_lines[32][MAXCMDLINE];
      ^~~~~~~~~

engine/hexen2/keys.c

@@ -541,7 +541,13 @@ static void Key_Console (int key)
 			workline[MAXCMDLINE - 2] = 0;
 			workline += key_linepos;
 			len = strlen(workline) + 1;
+			#if defined(__GNUC__) && (__GNUC__ > 7)
+			#pragma GCC diagnostic ignored "-Warray-bounds"
+			#endif
 			memmove (workline + 1, workline, len);
+			#if defined(__GNUC__) && (__GNUC__ > 7)
+			#pragma GCC diagnostic pop
+			#endif
 			*workline = key;
 		}
 		else

engine/hexenworld/client/keys.c

@@ -572,7 +572,13 @@ static void Key_Console (int key)
 			workline[MAXCMDLINE - 2] = 0;
 			workline += key_linepos;
 			len = strlen(workline) + 1;
+			#if defined(__GNUC__) && (__GNUC__ > 7)
+			#pragma GCC diagnostic ignored "-Warray-bounds"
+			#endif
 			memmove (workline + 1, workline, len);
+			#if defined(__GNUC__) && (__GNUC__ > 7)
+			#pragma GCC diagnostic pop
+			#endif
 			*workline = key;
 		}
 		else