meson: add subprojects to build

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: Ia7a24e92715cca5ee890d67d7b645feada4ec68b
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..6da54be
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+build*/
+subprojects/*
+!subprojects/*.wrap