kconfig: sync to Linux 4.20

The previous sync was commit 18895514dc5e ("kconfig: update to
v3.18-rc6").

Some commits were applied on top of that since then, but equivalent
fixups were done in Linux.

So, this commit overwrites everything scripts/kconfig/ with the one
from Linux 4.20

Highlights:

 - 'silentoldconfig' has been renamed to 'syncconfig'
   (the top Makefile needs to be adjusted)

 - 'testconfig' target has been added for unit-tests
   (the top Makefile needs to export PYTHON3 because
    the test frame relies on Python3 and pytest)

 - The perfect hash table generated by gperf has been removed

 - The localization support has been removed

 - The 'option env=VAR' has been replaced with more generic
   variable reference syntax $(VAR)
   (./Kconfig and common/Kconfig need to be adjusted)

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 23 insertions, 0 deletions

diff --git a/scripts/kconfig/tests/inter_choice/Kconfig b/scripts/kconfig/tests/inter_choice/Kconfig
new file mode 100644
index 0000000000..e44449f075
--- /dev/null
+++ b/scripts/kconfig/tests/inter_choice/Kconfig
@@ -0,0 +1,23 @@
+config MODULES
+	def_bool y
+	option modules
+
+choice
+	prompt "Choice"
+
+config CHOICE_VAL0
+	tristate "Choice 0"
+
+config CHOIVE_VAL1
+	tristate "Choice 1"
+
+endchoice
+
+choice
+	prompt "Another choice"
+	depends on CHOICE_VAL0
+
+config DUMMY
+	bool "dummy"
+
+endchoice