Bug#585089:

[Scott Howard]

Fixed the FTBFS for not defining __freebsd_kernel__.

New FTBFS:
gcc -shared  /build/buildd-rxtx_2.2pre2-5-kfreebsd-i386-z7JZih/rxtx-2.2pre2/i486-pc-kfreebsd-gnu/.libs/SerialImp.o
/build/buildd-rxtx_2.2pre2-5-kfreebsd-i386-z7JZih/rxtx-2.2pre2/i486-pc-kfreebsd-gnu/.libs/fuserImp.o
 -lc_r  -Wl,-soname -Wl,librxtxSerial-2.2pre1.so -o
.libs/librxtxSerial-2.2pre1.so
/usr/bin/ld: cannot find -lc_r


-lc_r is removed [1] (try -lpthreads instead?).  We are linking to it
in [2]. We also need to fix target lib to be shared:
 581         TARGETLIB="\$(target_triplet)/librxtxSerial.la \
 582                         \$(target_triplet)/librxtxParallel.la"


I requested the build-deps to be installed on io.debian.net for porting


[1] http://unix.derkeiler.com/Mailing-Lists/FreeBSD/arch/2005-10/0060.html
[2] http://git.debian.org/?p=pkg-java/rxtx.git;a=blob;f=configure.in#l578