build: fix shebangs

- mangling shebang warnings
- ambiguous python shebang error

data/pluma-bugreport.sh.in

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/usr/bin/sh
 
 PKG_CONFIG_MODULES="glib-2.0 gtk+-3.0 gtksourceview-4 enchant iso-codes"
 

plugins/externaltools/data/build.tool.in

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/usr/bin/sh
 
 EHOME=`echo $HOME | sed "s/#/\#/"`
 DIR=$PLUMA_CURRENT_DOCUMENT_DIR

plugins/externaltools/data/open-terminal-here.tool.in

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/usr/bin/sh
 
 #TODO: use "mateconftool-2 -g /desktop/mate/applications/terminal/exec"
 mate-terminal --working-directory=$PLUMA_CURRENT_DOCUMENT_DIR &

plugins/externaltools/data/remove-trailing-spaces.tool.in

@@ -1,3 +1,3 @@
-#!/bin/sh
+#!/usr/bin/sh
 
 sed 's/[[:blank:]]*$//'

plugins/externaltools/data/run-command.tool.in

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/usr/bin/sh
 
 #TODO: use "gsettings get org.mate.applications-terminal exec"
 exec `zenity --entry --title="Run command - Pluma" --text="Command to run"`

plugins/externaltools/data/search-recursive.tool.in

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/sh
 # Copyright © 2011 Perberos
 #
 # This program is free software; you can redistribute it and/or modify it

plugins/externaltools/data/switch-c.tool.in

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 # Copyright © 2011 Perberos
 # Copyright © 2012-2017 MATE developers