package/e2fsprogs: fix 0002 patch

package/e2fsprogs: fix 0002 patch

Patch 0002-fuse2fs-might-need-librt.patch introduced a new configure.ac
variable that should contain whether -lrt is needed to gt clock_gettime.

However, it forgot to propagate that variable into the Makefiles.

Because e2fprogs is not using automake (just autoconf), the configure
variables are not automatically propagated; it needs to be done
manually.

Fixes:
    http://autobuild.buildroot.org/results/edf/edf4195d33720d51031a84c3bdb6b6b0ed3b4731/
    http://autobuild.buildroot.org/results/987/987efb687870062c509361eaefd0ff80043392f8/
    http://autobuild.buildroot.org/results/f58/f58b5f8f5cd069b63aae4249bc7aefb145789b7d/
    [...]

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>