kmscon: fix build with glibc>=2.26.

Closes #10868.

Signed-off-by: Enno Boland <gottox@voidlinux.eu>

srcpkgs/kmscon/patches/define-SIGUNUSED-for-GLIBC.patch

@@ -0,0 +1,17 @@
+--- src/pty.c
++++ src/pty.c
+@@ -46,6 +46,14 @@
+ 
+ #define KMSCON_NREAD 16384
+ 
++/* ever since glibc 2.26 SIGUNUSED is no longer defined on any architerture
++ * http://man7.org/linux/man-pages/man7/signal.7.html
++ * according to signal(7) SIGUNUSED is synonymous with SIGSYS, musl defines it as such
++ */
++#ifdef __GLIBC__
++#define SIGUNUSED SIGSYS
++#endif
++
+ struct kmscon_pty {
+ 	unsigned long ref;
+ 	struct ev_eloop *eloop;

srcpkgs/kmscon/template

@@ -1,7 +1,7 @@
 # Template file for 'kmscon'
 pkgname=kmscon
 version=8
-revision=5
+revision=6
 lib32disabled=yes
 build_style=gnu-configure
 configure_args="--disable-static --disable-multi-seat"