squid: update to version 4.12

squid: update to version 4.12

- Fixes CVEs:

CVE-2019-12519
CVE-2019-12520
CVE-2019-12521
CVE-2019-12523
CVE-2019-12524
CVE-2019-12525
CVE-2019-12526
CVE-2019-12527
CVE-2019-12528
CVE-2019-12529
CVE-2019-12824
CVE-2019-12854
CVE-2019-13345
CVE-2019-18676
CVE-2019-18677
CVE-2019-18678
CVE-2019-18679

CVE-2020-8449
CVE-2020-8450
CVE-2020-11945
CVE-2020-14058
CVE-2020-15049

- Remove patch for cross-compilation
The patch should not be included in the OpenWrt at all without any
commit message/description.
Is not needed and there should be used HOST variables instead of BUILD variables (e.g.
   HOSTCXX)
However, the BUILDCXX is set in Makefile to HOSTCXX

- Renumber glibc patch and refresh it

Signed-off-by: Josef Schlehofer <pepe.schlehofer@gmail.com>