Use shebang line that can work on different distributions (#1156)

linux/autogen.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 ./pre-build.sh
 autoreconf -i

linux/build

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 BLD_FLAGS="-std=gnu99 -Wno-write-strings -DGPAC_CONFIG_LINUX -D_FILE_OFFSET_BITS=64 -DVERSION_FILE_PRESENT -DENABLE_OCR -DFT2_BUILD_LIBRARY -DGPAC_DISABLE_VTT -DGPAC_DISABLE_OD_DUMP"
 bit_os=$(getconf LONG_BIT)
 if [ "$bit_os"=="64" ]

linux/build-static.sh

@@ -1,4 +1,4 @@
-#!/bin/sh -ex
+#!/usr/bin/env sh -ex
 
 ####################################################################
 # setup by tracey apr 2012

linux/build_hardsubx

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 BLD_FLAGS="-g -std=gnu99 -Wno-write-strings -DGPAC_CONFIG_LINUX -D_FILE_OFFSET_BITS=64 -DVERSION_FILE_PRESENT -DENABLE_OCR -DENABLE_HARDSUBX -DFT2_BUILD_LIBRARY -DGPAC_DISABLE_VTT -DGPAC_DISABLE_OD_DUMP"
 bit_os=$(getconf LONG_BIT)
 if [ "$bit_os"=="64" ]

linux/builddebug

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 BLD_FLAGS="-g -std=gnu99 -Wno-write-strings -DGPAC_CONFIG_LINUX -D_FILE_OFFSET_BITS=64 -DVERSION_FILE_PRESENT -DENABLE_OCR -DFT2_BUILD_LIBRARY -DGPAC_DISABLE_VTT -DGPAC_DISABLE_OD_DUMP"
 bit_os=$(getconf LONG_BIT)
 if [ "$bit_os"=="64" ]

linux/cleanup

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 make distclean > /dev/null 2>&1 || true
 rm -rf Makefile configure *.in config.status config.log aclocal.m4 build-conf autom4te.cache

linux/module_generator

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 SRC_LIBPNG="$(find ../src/libpng/ -name '*.c')"
 SRC_ZLIB="$(find ../src/zlib/ -name '*.c')"
 SRC_ZVBI="$(find ../src/zvbi/ -name '*.c')"

linux/pre-build.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 echo "Obtaining Git commit"
 commit=(`git rev-parse HEAD 2>/dev/null`)
 if [ -z "$commit" ]; then