wolfssl: Update to version 4.5.0

wolfssl: Update to version 4.5.0

This fixes the following security problems:
* In earlier versions of wolfSSL there exists a potential man in the
  middle attack on TLS 1.3 clients.
* Denial of service attack on TLS 1.3 servers from repetitively sending
  ChangeCipherSpecs messages. (CVE-2020-12457)
* Potential cache timing attacks on public key operations in builds that
  are not using SP (single precision). (CVE-2020-15309)
* When using SGX with EC scalar multiplication the possibility of side-
  channel attacks are present.
* Leak of private key in the case that PEM format private keys are
  bundled in with PEM certificates into a single file.
* During the handshake, clear application_data messages in epoch 0 are
  processed and returned to the application.

Full changelog:
https://www.wolfssl.com/docs/wolfssl-changelog/

Fix a build error on big endian systems by backporting a pull request:
https://github.com/wolfSSL/wolfssl/pull/3255

The size of the ipk increases on mips BE by 1.4%
old:
libwolfssl24_4.4.0-stable-2_mips_24kc.ipk:	386246
new:
libwolfssl24_4.5.0-stable-1_mips_24kc.ipk:	391528

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>