/dev/crypto auth error fix/adjustment for benchmark

[night1rider]

When configuring wolfSSL to use /dev/crypto and running our benchmark tool, GMAC benchmarks will throw the -265 error code after calling this line.

This is because is due to this line in /dev/crypto driver.

This PR adds better debugging and will set size when running GMAC to that of the system's page size. It also allows for an override for this size by setting the macro WOLFSSL_AUTHSZ_BENCH

[dgarske]

Retest this please - Python test

[JacobBarthelmeh]

Looks like sysconf is in QNX too (another system which has /dev/crypto) which is good, so seems portable enough for a call wrapped with the debug macro guard. Assign to wolfssl-bot when ready for a final review and potential merge into master branch.

[night1rider]

Some Extra Information:

sysconf is a apart of unistd.h which our port for /dev/crypto uses here. This document also states that _SC_PAGE_SIZE is apart of the table that defines the minimal set of system variables.

[JacobBarthelmeh]

Works as expected. Please resolve this warning though:

  CC       examples/server/examples_server_server-server.o
wolfcrypt/benchmark/benchmark.c: In function ‘bench_gmac’:
wolfcrypt/benchmark/benchmark.c:4846:71: warning: format ‘%d’ expects argument of type ‘int’, but argument 3 has type ‘long int’ [-Wformat=]
         printf("authIn Buffer Size[%d] greater than System Page Size[%d]\n",
                                                                      ~^
                                                                      %ld
                         bench_size, sysconf(_SC_PAGESIZE));
                                     ~~~~~~~~~~~~~~~~~~~~~              
  CC       examples/pem/pem.o

[night1rider]

Fixed to resolve warning with benchmark, and squashed.

[night1rider]

Retest this please