push sysroot down to other libs and things that don't use libtool as well, so…

push sysroot down to other libs and things that don't use libtool as well, so you don't need to specify it in a bunch of different ways when using it.

configure.ac

@@ -578,6 +578,12 @@ path_push_unique () {
   eval export $1="$2:$x"
 }
 
+if test -n $lt_sysroot ; then
+   APR_ADDTO(CFLAGS, --sysroot=$lt_sysroot)
+   APR_ADDTO(CXXFLAGS, --sysroot=$lt_sysroot)
+   APR_ADDTO(LDFLAGS, --sysroot=$lt_sysroot)
+fi
+
 # tweak platform specific flags
 case "$host" in
     *darwin13.*|*darwin12.*|*darwin11.*)