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.

Tested:
    Builds with the old version of autotools using the CI. Manually
    edited the CI to include the new 2019.01.19 version and ran the same
    test to ensure the coverage results are the same.

Change-Id: Iebc9a3c32de4fd1c2da26e6eb3bc44cf296a4ca6
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/.gitignore b/.gitignore
index 15f8350..b82c23f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -22,6 +22,7 @@
 .dirstamp
 .libs
 /aclocal.m4
+/aminclude_static.am
 /autom4te.cache
 /build-aux
 /confdefs.h