kbd: Fix build reproducibility issue

Our CFLAGS were being lost which was breaking reproducibile builds due to
losee of the debug prefix remapping flags. Fix this.

(From OE-Core rev: 037bef5c7dfe82642d19f07b38f6ccc783958e41)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-core/kbd/kbd/fix_cflags.patch

@@ -0,0 +1,25 @@
+We need to ensure our CFLAGS are preserved as well as whatever tweak configure
+tries to make. Without these, the debug prefix changes get lost and we lose
+build reproducibility, likely with other side effects.
+
+Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
+Upstream-Status: Pending
+2020/1/27
+
+Index: kbd-2.2.0/configure.ac
+===================================================================
+--- kbd-2.2.0.orig/configure.ac
++++ kbd-2.2.0/configure.ac
+@@ -72,9 +72,9 @@ if test "$enable_code_coverage" = yes; t
+ fi
+ 
+ case "$GCC,$ac_cv_prog_cc_g" in
+-	yes,yes) CFLAGS="-g $CC_O_LEVEL $FORTIFY_SOURCE" ;;
+-	yes,)    CFLAGS="$CC_O_LEVEL $FORTIFY_SOURCE" ;;
+-	   ,yes) CFLAGS="-g" ;;
++	yes,yes) CFLAGS="-g $CC_O_LEVEL $FORTIFY_SOURCE $CFLAGS" ;;
++	yes,)    CFLAGS="$CC_O_LEVEL $FORTIFY_SOURCE $CFLAGS" ;;
++	   ,yes) CFLAGS="-g $CFLAGS" ;;
+ esac
+ 
+ CC_CHECK_CFLAGS_APPEND([\

meta/recipes-core/kbd/kbd_2.2.0.bb

@@ -17,6 +17,7 @@ SRC_URI = "${KERNELORG_MIRROR}/linux/utils/${BPN}/${BP}.tar.xz \
            ${@bb.utils.contains('DISTRO_FEATURES', 'ptest', 'file://set-proper-path-of-resources.patch', '', d)} \
            file://0001-analyze.l-add-missing-string-format.patch \
            file://0001-Use-DATADIR-and-append-i386-to-fix-libkbdfile-test08.patch \
+           file://fix_cflags.patch \
            "
 
 SRC_URI[md5sum] = "d1d7ae0b5fb875dc082731e09cd0c8bc"