linux-libc-headers: remove redundant install_headers patch

This was added in the upgrade to 4.19[1] which included three patches
that were taken from the series at [2].

What merged was the second iteration of this series[3] which dropped the
install_headers patch, so we can drop this obsolete patch.

[1] oe-core 11f02b7c6f9854eecd3a49ea47833c8cbffb1581
[2] https://lore.kernel.org/linux-arm-kernel/1544556407-19897-1-git-send-email-Dave.Martin@arm.com/
[3] https://lore.kernel.org/linux-arm-kernel/1546607391-3850-1-git-send-email-Dave.Martin@arm.com/

(From OE-Core rev: 13e1c0d3881d6c9e4057096d41d8b4f4db1b6b97)

Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-kernel/linux-libc-headers/linux-libc-headers/0001-kbuild-install_headers.sh-Strip-_UAPI-from-if-define.patch

@@ -1,38 +0,0 @@
-From 9ca6c6a510bda90954aa2532711200b89dd1df89 Mon Sep 17 00:00:00 2001
-From: Dave Martin <Dave.Martin@arm.com>
-Date: Tue, 11 Dec 2018 19:26:45 +0000
-Subject: [PATCH 1/3] kbuild: install_headers.sh: Strip _UAPI from
- #if-defined() guards
-
-install_headers.sh knows how to strip the _UAPI prefix from #ifdef/
-ifndef and #define directives used to guard headers against multiple
-or inappropriate inclusion.  Currently this does not work for guards
-in the "#if defined()" style, which may be needed for non-trivial
-cases.
-
-This patch adds similar logic so that the _UAPI prefix is also
-stripped from guard directives written using "#if defined()" etc.
-
-This is not completely foolproof, but will work for simple cases of
-using #if defined() to guard against inappropriate header inclusion.
-
-Signed-off-by: Dave Martin <Dave.Martin@arm.com>
-Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>
-
-Upstream-Status: Submitted [https://www.spinics.net/lists/arm-kernel/msg694800.html]
----
- scripts/headers_install.sh | 1 +
- 1 file changed, 1 insertion(+)
-
-Index: linux-5.4/scripts/headers_install.sh
-===================================================================
---- linux-5.4.orig/scripts/headers_install.sh
-+++ linux-5.4/scripts/headers_install.sh
-@@ -36,6 +36,7 @@
- 	s/(^|[^a-zA-Z0-9])__packed([^a-zA-Z0-9_]|$)/\1__attribute__((packed))\2/g
- 	s/(^|[[:space:](])(inline|asm|volatile)([[:space:](]|$)/\1__\2__\3/g
- 	s@#(ifndef|define|endif[[:space:]]*/[*])[[:space:]]*_UAPI@#\1 @
-+        :1;s/(#(if|elif)(.*[^A-Za-z0-9_])defined\([[:space:]]*)_UAPI/\1/;t1
- ' $INFILE > $TMPFILE || exit 1
- 
- scripts/unifdef -U__KERNEL__ -D__EXPORTED_HEADERS__ $TMPFILE > $OUTFILE

meta/recipes-kernel/linux-libc-headers/linux-libc-headers_6.9.bb

@@ -6,10 +6,6 @@ SRC_URI:append:libc-musl = "\
     file://0001-libc-compat.h-musl-_does_-define-IFF_LOWER_UP-DORMAN.patch \
    "
 
-SRC_URI += "\
-    file://0001-kbuild-install_headers.sh-Strip-_UAPI-from-if-define.patch \
-"
-
 LIC_FILES_CHKSUM = "file://COPYING;md5=6bc538ed5bd9a7fc9398086aedcd7e46"
 
 SRC_URI[sha256sum] = "24fa01fb989c7a3e28453f117799168713766e119c5381dac30115f18f268149"