package/strace: fix build for no-MMU targets

package/strace: fix build for no-MMU targets

The latest strace version bump added a call to fork() which breaks build
for no-MMU. Add a patch that removes the unneeded fork() call on no-MMU.

Fixes:
http://autobuild.buildroot.net/results/4a0/4a0e2872b27be93f73137c7550eae1c1f479c160/
http://autobuild.buildroot.net/results/747/74711084a54dfc17ad0d4d1e5faabf6d8a605dca/

Cc: Nicolas Cavallari <nicolas.cavallari@green-communications.fr>
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>