Subject: Update .gitignore from Debian packaging branch

The Debian packaging git branch contains these updates to the upstream
.gitignore file(s).  This patch is autogenerated, to provide these
updates to users of the official Debian archive view of the package.

[dgit (12.9) update-gitignore]
---
diff --git a/.gitignore b/.gitignore
index f70f99c..1dfc9ba 100644
--- a/.gitignore
+++ b/.gitignore
@@ -24,4 +24,6 @@ _testmain.go
 *.prof
 
 # vendor
-/vendor
\ No newline at end of file
+/vendor
+/.pc/
+/_build/
