Ignore .gdb files from FLAT toolchains

* .gitignore: Add /*.gdb.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/.gitignore b/.gitignore
index dc91252..9f17271 100644
--- a/.gitignore
+++ b/.gitignore
@@ -23,5 +23,6 @@
 /missing
 /stamp-h1
 
+/*.gdb
 /ioctlsort
 /strace