tmux: Inherit MSYSTEM variable

Fixes issue #1183

tmux/PKGBUILD

@@ -2,7 +2,7 @@
 
 pkgname=tmux
 pkgver=2.6
-pkgrel=1
+pkgrel=2
 pkgdesc='A terminal multiplexer'
 url='https://tmux.github.io/'
 arch=('i686' 'x86_64')
@@ -13,16 +13,20 @@ depends=('ncurses' 'libevent')
 makedepends=('ncurses-devel' 'libevent-devel')
 source=(https://github.com/tmux/tmux/releases/download/$pkgver/tmux-$pkgver.tar.gz
         'msys-platform.patch'
-        'no-check-dirs-permission.patch')
+        'no-check-dirs-permission.patch'
+        'inherit-msystem-var.patch')
 
 sha256sums=('b17cd170a94d7b58c0698752e1f4f263ab6dc47425230df7e53a6435cc7cd7e8'
             'cf7e0f642d43fc97f7c55be41c693cceab5c891f81fcee687e918075e55cd533'
-            '8f1938c9bcb99fba5441e11379a193c17eee582a03c04f1bde8089d58a84f44f')
+            '8f1938c9bcb99fba5441e11379a193c17eee582a03c04f1bde8089d58a84f44f'
+            'c4dfb160e7aaeef37034868fc4b3083e87588f6f5d69a80a7d5f7d936073a822')
 
 prepare() {
   cd "${srcdir}/$pkgname-$pkgver"
   patch -p1 -i "${srcdir}"/msys-platform.patch
   patch -p0 -i "${srcdir}"/no-check-dirs-permission.patch
+  patch -p1 -i "${srcdir}"/inherit-msystem-var.patch
+
   cp osdep-cygwin.c osdep-msys.c
 
   #msg2 "Running autogen.sh"

tmux/inherit-msystem-var.patch

@@ -0,0 +1,13 @@
+diff --git a/options-table.c b/options-table.c
+index f5e973e..29f16f4 100644
+--- a/options-table.c
++++ b/options-table.c
+@@ -508,7 +508,7 @@ const struct options_table_entry options_table[] = {
+ 	  .type = OPTIONS_TABLE_ARRAY,
+ 	  .scope = OPTIONS_TABLE_SESSION,
+ 	  .default_str = "DISPLAY SSH_ASKPASS SSH_AUTH_SOCK SSH_AGENT_PID "
+-			 "SSH_CONNECTION WINDOWID XAUTHORITY"
++			 "SSH_CONNECTION WINDOWID XAUTHORITY MSYSTEM"
+ 	},
+ 
+ 	{ .name = "visual-activity",