Problem:

1. -Wcast-qual is not enabled with awslc.
2. The S2N_LIBCRYPTO environmental variable needs to be set for that -Wcast-qual to be enabled.
   

   s2n-tls/CMakeLists.txt

   Lines 212 to 215 in 45bf1d4

   	if (NOT $ENV{S2N_LIBCRYPTO} MATCHES "awslc")
   	# add cast-qual back in for non AWS-LC
   	target_compile_options(${PROJECT_NAME} PRIVATE -Wcast-qual)
   	endif()

Requirements / Acceptance Criteria:

What must a solution address in order to solve the problem? How do we know the solution is complete?

• -Wcast-qual should be enabled even if no environmental variables are set.
• -Wcast-qual should be enabled for awslc.