autotools: Fix for autoconf-archive 2019.01.19

The code coverage macros from the archive changed in a backward
incompatible way. This adds a workaround to autodetect either version
and do the right thing.

Change-Id: I4258fab8811f07760ebd73e8ac55c8493370e19b
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/.gitignore b/.gitignore
index 89226f6..65cf1e9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -19,6 +19,7 @@
 .dirstamp
 .libs
 /aclocal.m4
+/aminclude_static.am
 /autom4te.cache
 /build-aux
 /config.h