feh: update to 2.23

Add patch to fix building on musl environments: need to define
_BSD_SOURCE so that when string.h is included, strings.h is also
included.

Closes: #10524 [via git-merge-pr]

srcpkgs/feh/patches/musl-strings.patch

@@ -0,0 +1,16 @@
+feh.h includes X11/Xos.h which in turn includes string.h.  In musl
+environments, strings.h is not implicitly included unless we define either
+_BSD_SOURCE or _GNU_SOURCE.  Therefore, add -D_BSD_SOURCE so that when string.h
+is included, it also includes strings.h.
+
+--- ./config.mk	2018-01-07 14:26:09.423820119 -0500
++++ ./config.mk	2018-01-07 14:26:17.411888240 -0500
+@@ -38,7 +38,7 @@
+ CFLAGS += -Wall -Wextra -pedantic
+ 
+ # Settings for glibc >= 2.19 - may need to be adjusted for other systems
+-CFLAGS += -std=c11 -D_POSIX_C_SOURCE=200809L -D_XOPEN_SOURCE=500
++CFLAGS += -std=c11 -D_POSIX_C_SOURCE=200809L -D_XOPEN_SOURCE=500 -D_BSD_SOURCE
+ 
+ ifeq (${curl},1)
+ 	CFLAGS += -DHAVE_LIBCURL

srcpkgs/feh/template

@@ -1,6 +1,6 @@
 # Template file for 'feh'
 pkgname=feh
-version=2.22.2
+version=2.23
 revision=1
 hostmakedepends="pkg-config"
 makedepends="giblib-devel libcurl-devel libexif-devel
@@ -11,7 +11,7 @@ maintainer="Juan RP <xtraeme@voidlinux.eu>"
 license="MIT"
 homepage="https://feh.finalrewind.org/"
 distfiles="${homepage}/feh-${version}.tar.bz2"
-checksum=05a81fbe0997f6274c7617efc351647be38e5244c2624bd203459025c9a68ecd
+checksum=16df3cb813526a549e854aa82f80bcb299b9e83dd687ab4216a84e86f61722a1
 
 do_build() {
 	make ${makejobs} CC=$CC PREFIX=/usr exif=1 help=1 stat64=1