ci: remove bashisms and switch to #!/bin/sh

scripts/ci/common.sh

-#!/bin/bash
+#!/bin/sh
 ##### -*- mode:shell-script; indent-tabs-mode:nil; sh-basic-offset:2 -*-
 
 src_repo="$(pwd)"

scripts/ci/debsrcbuilder.sh

-#!/bin/bash
+#!/bin/sh
 ##### -*- mode:shell-script; indent-tabs-mode:nil; sh-basic-offset:2 -*-
 
 sdir="."

scripts/ci/erlang-rpm.sh

-#!/bin/bash
+#!/bin/sh
 ##### -*- mode:shell-script; indent-tabs-mode:nil; sh-basic-offset:2 -*-
 
 src_repo="$(pwd)"

scripts/ci/extras/erlangbuilder.sh

-#!/bin/bash
+#!/bin/sh
 ##### -*- mode:shell-script; indent-tabs-mode:nil; sh-basic-offset:2 -*-
 
 src_repo="$(pwd)"
@@ -13,7 +13,7 @@ if [ -z "$1" ]; then
   exit 1;
 fi
 
-mkdir -p $src_repo/rpmbuild/{SOURCES,BUILD,BUILDROOT,i386,x86_64,SOURCES,SPECS}
+(mkdir -p rpmbuild && cd $_ && mkdir -p SOURCES BUILD BUILDROOT i386 x86_64 SOURCES SPECS)
 cd $src_repo
 
 rpmbuild --define "_topdir %(pwd)/rpmbuild" \

scripts/ci/get_extra_sources.sh

-#!/bin/bash
+#!/bin/sh
 ##### -*- mode:shell-script; indent-tabs-mode:nil; sh-basic-offset:2 -*-
 
 src_repo="$(pwd)"
@@ -8,7 +8,7 @@ if [ ! -d .git ]; then
   exit 1;
 fi
 
-mkdir -p $src_repo/rpmbuild/{SOURCES,BUILD,BUILDROOT,i386,x86_64,SOURCES,SPECS}
+(mkdir -p rpmbuild && cd $_ && mkdir -p SOURCES BUILD BUILDROOT i386 x86_64 SOURCES SPECS)
 
 cd $src_repo/rpmbuild/SOURCES
 

scripts/ci/rpmbuilder.sh

-#!/bin/bash
+#!/bin/sh
 ##### -*- mode:shell-script; indent-tabs-mode:nil; sh-basic-offset:2 -*-
 
 sdir="."
@@ -12,7 +12,7 @@ dst_name="freeswitch-$cmajor.$cminor.$cmicro"
 dst_parent="/tmp/"
 dst_dir="/tmp/$dst_name"
 
-mkdir -p $src_repo/rpmbuild/{SOURCES,BUILD,BUILDROOT,i386,x86_64,SPECS}
+(mkdir -p rpmbuild && cd $_ && mkdir -p SOURCES BUILD BUILDROOT i386 x86_64 SPECS)
 
 cd $src_repo
 

scripts/ci/sounds-en-us-callie.sh

-#!/bin/bash
+#!/bin/sh
 ##### -*- mode:shell-script; indent-tabs-mode:nil; sh-basic-offset:2 -*-
 
 sdir="."

scripts/ci/sounds-music.sh

-#!/bin/bash
+#!/bin/sh
 ##### -*- mode:shell-script; indent-tabs-mode:nil; sh-basic-offset:2 -*-
 
 src_repo="$(pwd)"

scripts/ci/sounds-ru-ru-elena.sh

-#!/bin/bash
+#!/bin/sh
 ##### -*- mode:shell-script; indent-tabs-mode:nil; sh-basic-offset:2 -*-
 
 src_repo="$(pwd)"

scripts/ci/src_tarball.sh

-#!/bin/bash
+#!/bin/sh
 ##### -*- mode:shell-script; indent-tabs-mode:nil; sh-basic-offset:2 -*-
 
 sdir="."