Add a configure option --enable-jhbuild-wrapper-script

The current gnome-shell.in script has a huge amount of
unnecessary complexity for the installed, normal case.  Fix
this by adding a configure option (defaulting to false) that
installs a simple, obvious wrapper script around mutter.

We do change the gnome-shell build setup to pass this option
by default for jhbuild.

https://bugzilla.gnome.org/show_bug.cgi?id=642084

configure.ac

@@ -187,6 +187,24 @@ if test "$enable_compile_warnings" != no ; then
 fi
 changequote([,])dnl
 
+AC_ARG_ENABLE(jhbuild-wrapper-script,
+  AS_HELP_STRING([--jhbuild-wrapper-script=yes],[Make "gnome-shell" script work for jhbuild]),,enable_jhbuild_wrapper_script=no)
+AM_CONDITIONAL(USE_JHBUILD_WRAPPER_SCRIPT, test "x$enable_jhbuild_wrapper_script" = xyes)
+
+AC_MSG_CHECKING([for Ubuntu])
+if test -f /etc/ubuntu_version; then
+  enable_dynamic_mozjs_hack_default=yes
+  AC_MSG_RESULT([yes])
+else
+  enable_dynamic_mozjs_hack_default=no
+  AC_MSG_RESULT([no])
+fi
+
+AC_ARG_ENABLE(dynamic-mozjs-hack,
+  AS_HELP_STRING([--dynamic-mozjs-hack=no],[Look for libmozjs.so using pkg-config]),,enable_dynamic_mozjs_hack=$enable_dynamic_mozjs_hack_default)
+ENABLE_DYNAMIC_MOZJS_HACK=$enable_dynamic_mozjs_hack
+AC_SUBST(ENABLE_DYNAMIC_MOZJS_HACK)
+
 AC_PATH_PROG(mutter, [mutter])
 AC_SUBST(mutter)