twrp-5.1: add repo for bash

Change-Id: I59a84557b3a3aa4d52b941ad0a11bf87826713ab

twrp-extras.xml

@@ -11,7 +11,8 @@
 <!-- TWRP lives in TeamWin android-9.0 -->
     <project path="bootable/recovery" name="android_bootable_recovery" remote="TeamWin" revision="android-9.0"/>
 
-<!-- Include external LineageOS repos for nano -->
+<!-- Include external LineageOS repos for bash & nano -->
+    <project name="android_external_bash" path="external/bash" remote="LineageOS" revision="cm-12.1" />
     <project name="android_external_nano" path="external/nano" remote="LineageOS" revision="cm-12.1" />
     <project name="android_external_libncurses" path="external/libncurses" remote="LineageOS" revision="cm-12.1" />
     <project name="android_external_openssh" path="external/openssh" remote="LineageOS" revision="cm-12.1" />