Remove unused third_party/talloc

third_party/talloc/libtalloc.m4

-dnl find the talloc sources. This is meant to work both for 
-dnl talloc standalone builds, and builds of packages using talloc
-tallocdir=""
-tallocpaths=". lib/talloc talloc ../talloc ../lib/talloc"
-for d in $tallocpaths; do
-        if test -f "$srcdir/$d/talloc.c"; then
-                tallocdir="$d"
-                AC_SUBST(tallocdir)
-                break;
-        fi
-done
-if test x"$tallocdir" = "x"; then
-   AC_MSG_ERROR([cannot find talloc source in $tallocpaths])
-fi
-TALLOC_OBJ="talloc.o"
-AC_SUBST(TALLOC_OBJ)
-
-TALLOC_CFLAGS="-I$srcdir/$tallocdir"
-AC_SUBST(TALLOC_CFLAGS)
-
-TALLOC_LIBS=""
-AC_SUBST(TALLOC_LIBS)
-
-AC_CHECK_SIZEOF(size_t,cross)
-AC_CHECK_SIZEOF(void *,cross)
-
-if test $ac_cv_sizeof_size_t -lt $ac_cv_sizeof_void_p; then
-        AC_WARN([size_t cannot represent the amount of used memory of a process])
-        AC_WARN([please report this to <samba-technical@samba.org>])
-        AC_WARN([sizeof(size_t) = $ac_cv_sizeof_size_t])
-        AC_WARN([sizeof(void *) = $ac_cv_sizeof_void_p])
-        AC_ERROR([sizeof(size_t) < sizeof(void *)])
-fi
-
-if test x"$VERSIONSCRIPT" != "x"; then
-    EXPORTSFILE=talloc.exports
-    AC_SUBST(EXPORTSFILE)
-fi