buildall-fbandroid directive

Summary:
**Context:**
https://fb.workplace.com/groups/3864966283595977/posts/7591107320981836/?comment_id=7591451080947460

**Note: Should be used with care as android is in capacity crunch. See post: https://fb.workplace.com/groups/devx.ci.bffs/posts/1175562370238642.**

Reviewed By: thevinster

Differential Revision: D58478280

fbshipit-source-id: 678dc9347afd4c1fb819d8bef4c93b9632cdace9

td_util/src/directives.rs

@@ -59,6 +59,14 @@ pub fn should_build_all_fbobjc(directives: &Option<Vec<String>>, project: TdProj
         && project == TdProject::Fbobjc;
 }
 
+pub fn should_build_all_fbandroid(directives: &Option<Vec<String>>, project: TdProject) -> bool {
+    return directives
+        .iter()
+        .flatten()
+        .any(|build_directive| build_directive == "#buildall-fbandroid")
+        && project == TdProject::Fbandroid;
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;