All symbols starting with `u' in linuxdoom

• undefined src/doomdef.h:73
• UNIX src/readme.sound:22
• up src/p_pspr.c:278
• updates src/doomdef.h:121
• UploadNewPalette src/i_video.c:538
• use src/doomdef.h:62
• usecs src/changelog:92
• used src/s_sound.c:110
• usegamma src/v_video.c:137
• usejoystick src/m_misc.c:170
• usemouse src/m_misc.c:169
• using src/p_spec.c:482