git: remove a.out and include it in .gitignore

a.out is a configure script byproduct. It was mistakenly checked into the tree in !13118. This patch removes it, and include it in .gitignore to prevent a similar error in the future. (cherry picked from commit f0408eeb)

git: remove a.out and include it in .gitignore
8abb0f19 · Cheng Shao · 7bcc3dc6 · 8abb0f19
Commit 8abb0f19 authored 8 months ago by Cheng Shao
--- a/.gitignore
+++ b/.gitignore
@@ -35,6 +35,7 @@ Thumbs.db
 __pycache__
 .mypy_cache
 *.SYMDEF*
+a.out

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