remove duplicated SDL_hidapi_steam.c additions to watcom makefiles.

Makefile.os2

@@ -94,7 +94,7 @@ SRCS+= SDL_systimer.c
 SRCS+= SDL_sysloadso.c
 SRCS+= SDL_sysfilesystem.c
 SRCS+= SDL_os2joystick.c SDL_syshaptic.c SDL_sysjoystick.c SDL_virtualjoystick.c
-SRCS+= SDL_hidapijoystick.c SDL_hidapi_rumble.c SDL_hidapi_combined.c SDL_hidapi_gamecube.c SDL_hidapi_luna.c SDL_hidapi_ps3.c SDL_hidapi_ps4.c SDL_hidapi_ps5.c SDL_hidapi_shield.c SDL_hidapi_stadia.c SDL_hidapi_steam.c SDL_hidapi_switch.c SDL_hidapi_wii.c SDL_hidapi_xbox360.c SDL_hidapi_xbox360w.c SDL_hidapi_xboxone.c SDL_hidapi_steam.c
+SRCS+= SDL_hidapijoystick.c SDL_hidapi_rumble.c SDL_hidapi_combined.c SDL_hidapi_gamecube.c SDL_hidapi_luna.c SDL_hidapi_ps3.c SDL_hidapi_ps4.c SDL_hidapi_ps5.c SDL_hidapi_shield.c SDL_hidapi_stadia.c SDL_hidapi_switch.c SDL_hidapi_wii.c SDL_hidapi_xbox360.c SDL_hidapi_xbox360w.c SDL_hidapi_xboxone.c SDL_hidapi_steam.c
 SRCS+= SDL_dummyaudio.c SDL_diskaudio.c
 SRCS+= SDL_nullvideo.c SDL_nullframebuffer.c SDL_nullevents.c
 SRCS+= SDL_dummysensor.c

Makefile.w32

@@ -73,7 +73,7 @@ SRCS+= SDL_systimer.c
 SRCS+= SDL_sysloadso.c
 SRCS+= SDL_sysfilesystem.c
 SRCS+= SDL_syshaptic.c SDL_sysjoystick.c SDL_virtualjoystick.c
-SRCS+= SDL_hidapijoystick.c SDL_hidapi_rumble.c SDL_hidapi_combined.c SDL_hidapi_gamecube.c SDL_hidapi_luna.c SDL_hidapi_ps3.c SDL_hidapi_ps4.c SDL_hidapi_ps5.c SDL_hidapi_shield.c SDL_hidapi_stadia.c SDL_hidapi_steam.c SDL_hidapi_switch.c SDL_hidapi_wii.c SDL_hidapi_xbox360.c SDL_hidapi_xbox360w.c SDL_hidapi_xboxone.c SDL_hidapi_steam.c
+SRCS+= SDL_hidapijoystick.c SDL_hidapi_rumble.c SDL_hidapi_combined.c SDL_hidapi_gamecube.c SDL_hidapi_luna.c SDL_hidapi_ps3.c SDL_hidapi_ps4.c SDL_hidapi_ps5.c SDL_hidapi_shield.c SDL_hidapi_stadia.c SDL_hidapi_switch.c SDL_hidapi_wii.c SDL_hidapi_xbox360.c SDL_hidapi_xbox360w.c SDL_hidapi_xboxone.c SDL_hidapi_steam.c
 SRCS+= SDL_dummyaudio.c SDL_diskaudio.c
 SRCS+= SDL_nullvideo.c SDL_nullframebuffer.c SDL_nullevents.c
 SRCS+= SDL_dummysensor.c