build: fix out of tree builds

The test directory needs -I$(top_srcdir) in order to find the
header files provided by the project itself.  When doing an in-tree
build, this is done automatically by automake due to 'config.h'
being generated in the root.

Change-Id: I3ea13eda98a73122f370a70ecf1f8d2c66540346
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
1 file changed