message: fix compilation with recent compilers
diff: @@ -343,6 +343,7 @@ CFLAGS += '-Wno-psabi' -- suppress unimportant note about ABI compatibility in G
  CFLAGS += { '-Wall', '-Wdouble-promotion', '-Wfloat-conversion', '-fdata-sections', '-ffunction-sections'}
  CFLAGS += '-g'
  CFLAGS += '-DFIBRE_ENABLE_SERVER'
  +CFLAGS += '-Wno-nonnull'
  -- linker flags
  LDFLAGS += '-flto -lc -lm -lnosys' -- libs
  