add some compile-time artefacts to .gitignore

.gitignore

@@ -14,6 +14,7 @@ Makefile
 Makefile.in
 TESTS_ENVIRONMENT
 aclocal.m4
+ar-lib
 autom4te.cache
 compile
 config.guess
@@ -36,6 +37,7 @@ release/vagrant-static-linux/lnav
 src/bin2c
 src/config.h
 src/config.h.in
+src/default-config-json.c
 src/default-log-formats-json.c
 src/dump-pid-sh.c
 src/help.c