configure: Add basic support for Haiku

For compatibility with BeOS, Haiku's error codes are negative whereas recent
POSIX versions require them to be positive. As spotted by François, some
parts of QEMU code rely on this, so use a mapper library to convert them
to positive ones.

Cc: François Revol <revol@free.fr>
Cc: Ingo Weinhold <ingo_weinhold@gmx.de>

Haiku has network functions in libnetwork.so. It doesn't ship libutil.so.

Signed-off-by: Andreas Färber <andreas.faerber@web.de>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>

configure

@@ -319,6 +319,7 @@ io_thread="no"
 mixemu="no"
 kerneldir=""
 aix="no"
+haiku="no"
 blobs="yes"
 pkgversion=""
 check_utests="no"
@@ -336,6 +337,8 @@ elif check_define __OpenBSD__ ; then
   targetos='OpenBSD'
 elif check_define __sun__ ; then
   targetos='SunOS'
+elif check_define __HAIKU__ ; then
+  targetos='Haiku'
 else
   targetos=`uname -s`
 fi
@@ -451,6 +454,11 @@ AIX)
   aix="yes"
   make="gmake"
 ;;
+Haiku)
+  haiku="yes"
+  QEMU_CFLAGS="-DB_USE_POSITIVE_POSIX_ERRORS $QEMU_CFLAGS"
+  LIBS="-lposix_error_mapper -lnetwork $LIBS"
+;;
 *)
   audio_drv_list="oss"
   audio_possible_drivers="oss alsa sdl esd pa"
@@ -2030,7 +2038,7 @@ elif compile_prog "" "-lrt" ; then
 fi
 
 if test "$darwin" != "yes" -a "$mingw32" != "yes" -a "$solaris" != yes -a \
-        "$aix" != "yes" ; then
+        "$aix" != "yes" -a "$haiku" != "yes" ; then
     libs_softmmu="-lutil $libs_softmmu"
 fi
 
@@ -2353,6 +2361,9 @@ if test "$solaris" = "yes" ; then
     echo "CONFIG_NEEDS_LIBSUNMATH=y" >> $config_host_mak
   fi
 fi
+if test "$haiku" = "yes" ; then
+  echo "CONFIG_HAIKU=y" >> $config_host_mak
+fi
 if test "$static" = "yes" ; then
   echo "CONFIG_STATIC=y" >> $config_host_mak
 fi