feat(clip): use Termux clipboard cmd on Android

Author: dbohdan

README.md

@@ -396,6 +396,7 @@ cap_mkdb /etc/login.conf
 - `PAGO_CLIP`:
   The command to use to copy text to the clipboard.
   The default differs by platform:
+    - Android: `termux-clipboard-set`
     - Linux and BSD: `xclip -in -selection clip`
     - macOS: `copy`
 - `PAGO_CONFIRM`:

config_android.go

@@ -0,0 +1,12 @@
+//go:build android
+
+// pago - a command-line password manager.
+//
+// License: MIT.
+// See the file LICENSE.
+
+package pago
+
+const (
+	DefaultClip = "termux-clipboard-set"
+)

config_posix.go config_default.goconfig_posix.go renamed to config_default.go

@@ -1,4 +1,4 @@
-//go:build !darwin && !windows
+//go:build !(android || darwin || windows)
 
 // pago - a command-line password manager.
 //