configure: Do not build pc-bios/optionrom on Haiku

Compilation of pc-bios/optionrom fails on Haiku with:

   BUILD   pvh.img
 ld: pvh_main.o: in function `pvh_load_kernel':
 pc-bios/optionrom/pvh_main.c:73: undefined reference to `GLOBAL_OFFSET_TABLE_'
 Makefile:57: recipe for target 'pvh.img' failed
 make[1]: *** [pvh.img] Error 1

Let's simply disable it, like it is already done on macOS and Solaris.

Message-Id: <20201114165137.15379-3-thuth@redhat.com>
Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Thomas Huth <thuth@redhat.com>

configure

@@ -5842,7 +5842,7 @@ fi
 roms=
 if { test "$cpu" = "i386" || test "$cpu" = "x86_64"; } && \
         test "$targetos" != "Darwin" && test "$targetos" != "SunOS" && \
-        test "$softmmu" = yes ; then
+        test "$targetos" != "Haiku" && test "$softmmu" = yes ; then
     # Different host OS linkers have different ideas about the name of the ELF
     # emulation. Linux and OpenBSD/amd64 use 'elf_i386'; FreeBSD uses the _fbsd
     # variant; OpenBSD/i386 uses the _obsd variant; and Windows uses i386pe.