Fix py3k linking issue on Linux

We now try the ${PYTHON_PREFIX}/lib directory first as it is more
likely to have the shared library also, and not just the static one.

configure.ac

@@ -29,12 +29,12 @@ PYTHON_LDFLAGS=""
 PYTHON_LIBS=""
 AC_DEFUN([ADD_PYTHON_INCDIR], [
 if [[ -d "$1" ]]; then
-    PYTHON_CFLAGS="-I\"$1\" $PYTHON_CFLAGS"
+    PYTHON_CFLAGS="$PYTHON_CFLAGS -I\"$1\""
 fi
 ])
 AC_DEFUN([ADD_PYTHON_LIBDIR], [
 if [[ -d "$1" ]]; then
-    PYTHON_LIBS="-L\"$1\" $PYTHON_LIBS"
+    PYTHON_LIBS="$PYTHON_LIBS -L\"$1\""
 fi
 ])
 ADD_PYTHON_INCDIR([${PYTHON_PREFIX}/include/python${PYTHON_VERSION}${PYTHON_ABIFLAGS}/])