text: Fix pthread detection
  
  configure.in always calls AC_CHECK_COMP_OPT(pthread) which succeeds with the
  toolchain used although it does not contain thread support:
  
  checking for mutex_lock in -lthread ... no
  checking for pthread_mutex_lock in -lpthread... no
  checking for pthread_mutex_lock in -lc... no
  checking if compiler accepts -pthread... yes
  checking for pthread_mutex_lock in -lc... no
  checking for pthread_mutex_lock in -lpthread... no
  
  This positive configure check leads to
  
      CFLAGS="$CFLAGS -pthread"
  
  in ./configure, line 15757 which causes a compilation bug
  /home/br/br4/output/host/opt/ext-toolchain/bin/../lib/gcc/arm-buildroot-linux-uclibcgnueabi/4.8.3/../../../../arm-buildroot-linux-uclibcgnueab
  
  using this defconfig
  http://autobuild.buildroot.net/results/e86/e86e97ff7887f1bdc6bf913498392ff50f56ea88/defconfig
  
  This patch disables the freebsd-only code path. Patching configure directly
  prevents the need for autoreconf.
  
  Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
  
  diff -uNr unixODBC-2.3.2.org/configure unixODBC-2.3.2/configure
  --- unixODBC-2.3.2.org/configure	2013-10-08 10:56:03.000000000 +0200
  +++ unixODBC-2.3.2/configure	2015-03-13 21:19:59.210429211 +0100
  @@ -15746,7 +15746,7 @@
   
       fi
   
  -    if test "x$gotthread" = "xno"; then
  +    if test "x$gotthread" = "xnot_needed_for_buildroot"; then
         if test "x$ac_cv_c_compiler_gnu" = "xyes"; then
                   { $as_echo "$as_me:${as_lineno-$LINENO}: checking if compiler accepts -pthread" >&5
   $as_echo_n "checking if compiler accepts -pthread... " >&6; }
  