build: enable code coverage

Enable code coverage for the project.  Valgrind not enabled in this
step.

Tested: Verified code coverage step now running.
Change-Id: Ieb3606e5ad741fb0dd181f8da594c18258efa6bc
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/.gitignore b/.gitignore
index 18c7f73..51fda67 100644
--- a/.gitignore
+++ b/.gitignore
@@ -22,6 +22,7 @@
 .dirstamp
 .libs
 /aclocal.m4
+/aminclude_static.am
 /autom4te.cache
 /build-aux
 /confdefs.h