[headers] move '#!/bin/..' line as the first line

src/plugins/e-acsl/scripts/e-acsl-gcc.sh

+#!/bin/sh -e
 ##########################################################################
 #                                                                        #
 #  This file is part of Frama-C.                                         #
@@ -20,8 +21,6 @@
 #                                                                        #
 ##########################################################################
 
-#!/bin/sh -e
-
 # Convenience wrapper for small runs of E-ACSL Frama-C plugin
 
 # Print a message to STDERR and exit. If the second argument (exit code)

src/plugins/e-acsl/scripts/testrun.sh

+#!/bin/sh -e
 ##########################################################################
 #                                                                        #
 #  This file is part of Frama-C.                                         #
@@ -20,8 +21,6 @@
 #                                                                        #
 ##########################################################################
 
-#!/bin/sh -e
-
 # Convenience script for running tests with E-ACSL. Given a source file the
 # sequence is as follows:
 #   1. Instrument and compile a given source file with `e-acsl-gcc.sh`