Makefile: fix build break in sdk target

After commit 6729050f3a49dba42d2d881d31dbefd6b82b8dad nothing creates
$(HOST_DIR)/share/buildroot anymore, causing sdk to fail with:

 /bin/bash: .../output/host/share/buildroot/sdk-location: No such file or directory

Add creation of that directory to the "sdk" build steps itself.

Signed-off-by: Stefan Becker <chemobejk@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
1 file changed