scripts: remove unnecessary ihex2fw and check-lc_ctypes from .gitignore

Commit c512d254 ("gitignore: ignore scripts/ihex2fw") was unneeded.
ihex2fw was generated in firmware/ instead of scripts/ at that time
although ihex2fw.c was pushed back and forth between those directories
in the past.

check-lc_ctype was removed by commit cb43fb57 ("docs: remove
DocBook from the building system").
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

scripts/.gitignore

@@ -6,9 +6,7 @@ conmakehash
 kallsyms
 pnmtologo
 unifdef
-ihex2fw
 recordmcount
-check-lc_ctype
 sortextable
 asn1_compiler
 extract-cert