Compilation broken on master

[graftholders-dev]

In my cmake:

FetchContent_Declare(CppLinuxSerial # name of the content
  GIT_REPOSITORY https://github.com/gbmhunter/CppLinuxSerial.git # the repository
  GIT_TAG master # the tag
)

if(NOT CppLinuxSerial_POPULATED)
  FetchContent_Populate(CppLinuxSerial)
  add_subdirectory(${cpplinuxserial_SOURCE_DIR} ${cpplinuxserial_BINARY_DIR} EXCLUDE_FROM_ALL)
endif()

FetchContent_MakeAvailable(CppLinuxSerial)
message("CppLinuxSerial fetched")

With master, now I have

/home/triccyx/Documents/mini/ENRG_GR02905_BITRON_OCPP_LIBRARY/build/_deps/cpplinuxserial-src/include/CppLinuxSerial/SerialPort.hpp:123:51: error: ‘speed_t’ has not been declared
  123 |             SerialPort(const std::string &device, speed_t baudRate);

If I switch to tag=v2.8.2 all is ok.

[gbmhunter]

Ahh woops I think this is the result of this MR I merged in yesterday: 5db4fa6

Specifically, it's probably the removal of #include <asm/termbits.h> from the serial port header file which has done it. I'll re-add it back in.

[gbmhunter]

@graftholders-dev I've pushed a potential fix, could you try the latest master?