gdb: bump 7.4.x series to 7.4.1

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

toolchain/gdb/Config.in

@@ -103,4 +103,4 @@ config BR2_GDB_VERSION
 	default "7.1a"     if BR2_GDB_VERSION_7_1
 	default "7.2a"     if BR2_GDB_VERSION_7_2
 	default "7.3.1"    if BR2_GDB_VERSION_7_3
-	default "7.4"      if BR2_GDB_VERSION_7_4
+	default "7.4.1"    if BR2_GDB_VERSION_7_4