cmake LWS_HAVE_STRINGS_H examples

warmcat/libwebsockets CMakeLists.txt :674 

CHECK_C_SOURCE_COMPILES("#include <strings.h>\nvoid main(void) { while(1) ; } void xxexit(void){}" LWS_HAVE_STRINGS_H)

c-jimenez/open-ocpp 3rdparty/libwebsockets/CMakeLists.txt :638 

CHECK_INCLUDE_FILE(strings.h LWS_HAVE_STRINGS_H)

fluffos/fluffos src/thirdparty/libwebsockets/CMakeLists.txt :621 

CHECK_INCLUDE_FILE(strings.h LWS_HAVE_STRINGS_H)