2.9.0

Fixed wrong open mode used in test code. #417
Fixed invalid literal PRI* when compiling with C++. #416
Fixed issues with truncated ZLIB output. #414, #415
Added shim functions for HMAC_CTX when not available with OpenSSL < 1.1. #409
Fixed append mode when creating zip file using compatibility layer. #408
Turned off signing by default in the code which no longer requires defining MZ_ZIP_NO_SIGNING.
Added support for building zips on RISC OS. #410
Fixed BUILD_BYPRODUCTS argument for zlib in CMakeLists.txt. #406
Various fixed to code formatting. #421, #413