openwrt: add patch to expose unset symbols (#2702)

The GitHub actions pipeline is not interrupted for unset symbols due to
OpenWrt not failing in all cases of unset symbols.

Adda patch to consistently fail for unset symbols.

Ref #2701 (build process is waiting for user input)

Signed-off-by: David Bauer <mail@david-bauer.net>

Signed-off-by: David Bauer <mail@david-bauer.net>

patches/openwrt/0010-kconfig-abort-configuration-on-unset-symbol.patch

+From: David Bauer <mail@david-bauer.net>
+Date: Fri, 11 Nov 2022 13:37:07 +0100
+Subject: kconfig: abort configuration on unset symbol
+
+This fixes the initial patch to cover all cases where unset symbols are
+handled in the code.
+
+Fixes commit eaa9c94c7574 ("generic: Kconfig: exit on unset symbol")
+
+Signed-off-by: David Bauer <mail@david-bauer.net>
+
+diff --git a/target/linux/generic/hack-5.10/205-kconfig-abort-configuration-on-unset-symbol.patch b/target/linux/generic/hack-5.10/205-kconfig-abort-configuration-on-unset-symbol.patch
+new file mode 100644
+index 0000000000000000000000000000000000000000..bd5c54d4b8b73b36c9f5b809447a8e76fce19e5d
+--- /dev/null
++++ b/target/linux/generic/hack-5.10/205-kconfig-abort-configuration-on-unset-symbol.patch
+@@ -0,0 +1,41 @@
++From 310e8e04a05d9eb43fa9dd7f00143300afcaa37a Mon Sep 17 00:00:00 2001
++From: David Bauer <mail@david-bauer.net>
++Date: Fri, 11 Nov 2022 13:33:44 +0100
++Subject: [PATCH] kconfig: abort configuration on unset symbol
++
++When a target configuration has unset Kconfig symbols, the build will
++fail when OpenWrt is compiled with V=s and stdin is connected to a tty.
++
++In case OpenWrt is compiled without either of these preconditions, the
++build will succeed with the symbols in question being unset.
++
++Modify the kernel configuration in a way it fails on unset symbols
++regardless of the aforementioned preconditions.
++
++Signed-off-by: David Bauer <mail@david-bauer.net>
++---
++ scripts/kconfig/conf.c | 6 ++++++
++ 1 file changed, 6 insertions(+)
++
++--- a/scripts/kconfig/conf.c
+++++ b/scripts/kconfig/conf.c
++@@ -109,6 +109,9 @@ static int conf_askvalue(struct symbol *
++ 		}
++ 		/* fall through */
++ 	case oldaskconfig:
+++		if (!tty_stdio && getenv("FAIL_ON_UNCONFIGURED")) {
+++			exit(1);
+++		}
++ 		fflush(stdout);
++ 		xfgets(line, sizeof(line), stdin);
++ 		return 1;
++@@ -303,6 +306,9 @@ static int conf_choice(struct menu *menu
++ 			}
++ 			/* fall through */
++ 		case oldaskconfig:
+++			if (!tty_stdio && getenv("FAIL_ON_UNCONFIGURED")) {
+++				exit(1);
+++			}
++ 			fflush(stdout);
++ 			xfgets(line, sizeof(line), stdin);
++ 			strip(line);
+diff --git a/target/linux/generic/hack-5.10/205-kconfig-exit.patch b/target/linux/generic/hack-5.10/205-kconfig-exit.patch
+deleted file mode 100644
+index c3fb7a1f999e56da34b0a15565ce36098cfba7fb..0000000000000000000000000000000000000000
+--- a/target/linux/generic/hack-5.10/205-kconfig-exit.patch
++++ /dev/null
+@@ -1,11 +0,0 @@
+---- a/scripts/kconfig/conf.c
+-+++ b/scripts/kconfig/conf.c
+-@@ -215,6 +215,8 @@ static int conf_sym(struct menu *menu)
+- 				break;
+- 			continue;
+- 		case 0:
+-+			if (!sym_has_value(sym) && !tty_stdio && getenv("FAIL_ON_UNCONFIGURED"))
+-+				exit(1);
+- 			newval = oldval;
+- 			break;
+- 		case '?':