[FS#1003] Flex does not build with GCC 7.2

[LEDE Bugs]

The following task is now closed:

FS#1003 - Flex does not build with GCC 7.2
User who did this - Hans Dedecker (dedeckeh)

Reason for closing: Fixed
Additional comments about closing: Fixed in commit https://git.lede-project.org/?p=source.git;a=commit;h=0fb14a2b1ab2f82ce63f4437b062229d73d90516

More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=1003