Bug 1834543 - Remove `-lssp` flag for `_FORTIFY_SOURCE` in `mingw-clang` r=firefox-build-system-reviewers,glandium

See: https://www.msys2.org/news/#2022-10-10-libssp-is-no-longer-required

Differential Revision: https://phabricator.services.mozilla.com/D179985

build/moz.configure/toolchain.configure

@@ -2401,9 +2401,6 @@ def security_hardening_cflags(
         if compiler_is_gccish and optimize and not asan:
             flags.append("-U_FORTIFY_SOURCE")
             flags.append("-D_FORTIFY_SOURCE=2")
-            if mingw_clang:
-                # mingw-clang needs to link in ssp which is not done by default
-                ldflags.append("-lssp")
 
         # fstack-protector ------------------------------------
         # Enable only if hardening is not disabled and ASAN is