Add json-c meson wrap

Needed for distros like Debian that still only have an old json-c.

Also, apparantly json-c intends people to use <json.h> with
-I${prefix}/include/json-c, as that's what their pkg-config and
documentation says, so this also swaps over to that. It's also needed
for the subproject to work.

1 files changed, 2 insertions, 0 deletions

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..3d6b41c
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+subprojects/packagecache
+subprojects/json-c-0.13.1