Remove build hacks for FreeBSD.

* configure.ac [freebsd]: Do not add /usr/local to CPPFLAGS and
LDFLAGS.
--

Back in ~2000 we introduced a quick hack to make building of Libgcrypt
on FreeBSD easier by always adding -I/usr/local/include and
-L/usr/local/lib .  It turned out that this is a bad idea if one wants
to build with library version which is not installed in /usr/local.
The hack made was eventually (in 2003) copied from Libgcrypt to
GnuPG-2.

configure.ac

@@ -627,12 +627,6 @@ case "${host}" in
         try_gettext="no"
         ;;
 
-    *-*-freebsd*)
-       # FreeBSD
-       CPPFLAGS="$CPPFLAGS -I/usr/local/include"
-       LDFLAGS="$LDFLAGS -L/usr/local/lib"
-       ;;
-
     *-*-hpux*)
         if test -z "$GCC" ; then
             CFLAGS="$CFLAGS -Ae -D_HPUX_SOURCE"