Ports: Remove bashisms and switch all scripts to /bin/sh.

Ports/bash/bash.sh

@@ -1,6 +1,6 @@
 #!/bin/sh
 PORT_DIR=bash
-function fetch() {
+fetch() {
     run_fetch_git "https://git.savannah.gnu.org/git/bash.git"
 
     # Add serenity as a system for configure
@@ -13,16 +13,16 @@ function fetch() {
     # Locale calls crash right now. LibC bug, probably.
     run_patch disable-locale.patch -p1
 }
-function configure() {
+configure() {
     run_configure_autotools --disable-nls --without-bash-malloc
 }
-function build() {
+build() {
     # Avoid some broken cross compile tests...
     run_replace_in_file "s/define GETCWD_BROKEN 1/undef GETCWD_BROKEN/" config.h
     run_replace_in_file "s/define CAN_REDEFINE_GETENV 1/undef CAN_REDEFINE_GETENV/" config.h
     run_make
 }
-function install() {
+install() {
     run_make_install DESTDIR="$SERENITY_ROOT"/Root
 }
-source ../.port_include.sh
+. ../.port_include.sh