OpenSSH Key and ED25519 support #39
Added _libssh2_explicit_zero() to explicitly zero sensitive data in memory #120
* ED25519 Key file support - Requires OpenSSL 1.1.1 or later
* OpenSSH Key format reading support - Supports RSA/DSA/ECDSA/ED25519 types
* New string buffer reading functions - These add build-in bounds checking and convenance methods. Used for OpenSSL PEM file reading.
* Added new tests for OpenSSH formatted Keys
* tests: Remove if-pyramids
* tests: Switch run_command arguments
* tests: Make run_command a vararg function
* tests: Xcode doesn't obey CMake's test working directory
* openssl: move manual AES-CTR cipher into crypto init
* cmake: Move our include dir before all other include paths
VS2015 moved stdio functions to the header files as inline function. That means check_function_exists can't detect them because it doesn't use header files - just does a link check. Instead we need to use check_symbol_exists with the correct headers.
Autotools expects a configuration template file at src/libssh2_config.h.in, which buildconf generates. But the CMake build system has its CMake-specific version of the file at this path. This means that, if you don't run buildconf, the Autotools build will fail because it configured the wrong header template.
See https://github.com/libssh2/libssh2/pull/8.
