crt: Remove the vestigial gs_support.c

This was a partial (but incomplete!) support for the MSVC stack
cookie handling (under the MSVC option /GS, similar to GCC and
Clang/MinGW's -fstack-protector-strong). This contained the
stack cookie itself and the init function, and the error reporting
function, but not the checking function (__security_check_cookie).
And these functions would only end up being called by code generated
by MSVC anyway.

Signed-off-by: Martin Storsjö <martin@martin.st>
5 files changed