Fixes the eapol_test build using clang >= 11
../src/radius/radius_client.c:817:24: error: cast to smaller integer type 'RadiusType' from 'void *' [-Werror,-Wvoid-pointer-to-enum-cast]
RadiusType msg_type = (RadiusType) sock_ctx;
# be modified from here. In most cases, these lines should use += in order not
# to override previous values of the variables.
-CFLAGS += -g3 -O0 -Wno-error=deprecated-declarations
+CFLAGS += -g3 -O0 -Wno-error=deprecated-declarations -Wno-error=void-pointer-to-enum-cast
CFLAGS += -I /usr/local/opt/openssl/include -I/usr/local/include/openssl
LIBS += -L/usr/local/opt/openssl/lib -L/usr/local/lib