gitignore: add scripts/recordmcount

This file is generated, should be ignored by git.
Signed-off-by: NWANG Cong <xiyou.wangcong@gmail.com>
Signed-off-by: NMichal Marek <mmarek@suse.cz>

scripts/.gitignore

@@ -7,3 +7,4 @@ pnmtologo
 bin2c
 unifdef
 ihex2fw
+recordmcount