gitignore: Don't ignore all '*.in' files

Currently .gitignore file contains the '*.in' pattern to ignore build
files 'Makefile.in' and 'config.h.in'.
But this pattern shouldn't be used since the repository contains files
like 'libmctp.pc.in' or 'udev/rules.d/mctp0-raw-kcsX.rules.in'.
To solve the issue drop the '*.in' pattern from the ignore list and add
'Makefile.in' and 'config.h.in' directly.

Change-Id: Idfac893a6b5430b2492301ec633c9fc53059f503
Signed-off-by: Konstantin Aladyshev <aladyshev22@gmail.com>
diff --git a/.gitignore b/.gitignore
index d2779ed..6e37acf 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,6 +5,7 @@
 autom4te.cache
 compile
 config.guess
+config.h.in
 config.log
 config.status
 config.sub
@@ -15,7 +16,6 @@
 .dirstamp
 *.gcda
 *.gcno
-*.in
 install-sh
 *.la
 libtool
@@ -24,6 +24,7 @@
 ltmain.sh
 m4
 Makefile
+Makefile.in
 missing
 *.o
 stamp-h1