Add cppcheck suppressions for unused functions that belong to the public library interface

11 jobs for clean-cppcheck in 6 minutes and 5 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
passed #75425
VS2015
VS2015-32-bit

00:01:11

passed #75424
VS2015
VS2015-64-bit

00:01:24

passed #75423
VS2017
VS2017-32-bit

00:01:20

passed #75422
VS2015
VS2017-64-bit

00:01:17

passed #75419
Linux
clang-c++11

00:04:13

passed #75428
Linux
cppcheck

00:04:03

passed #75426
Linux
doc

00:00:09

passed #75418
Linux
gcc-c++11

00:02:43

passed #75420
Apple
macos-c++11

00:02:57

failed #75427
Linux
cppcheck

00:00:30

passed #75421
Linux
cppcheck

00:00:22