Fix ac_add_options --enable-install-strip

[K4sum1]

This breaks the installer for some reason. Not sure what the error was exactly since probably been over a year since I last tried, but it's cryptic and nothing really to go odd of.

[OwnedByWuigi]

Can you send the compiler "bitching" about it?

Might be able to fix

[K4sum1]

 2:36.72 Traceback (most recent call last):
 2:36.75   File "c:/Users/Admin/Documents/GitHub/UXP/toolkit/mozapps/installer/packager.py", line 379, in <module>
 2:36.75     main()
 2:36.75   File "c:/Users/Admin/Documents/GitHub/UXP/toolkit/mozapps/installer/packager.py", line 375, in main
 2:36.76     copier.copy(args.destination)
 2:36.76   File "c:\Users\Admin\Documents\GitHub\UXP\python\mozbuild\mozpack\copier.py", line 399, in copy
 2:36.76     copy_results.append((destfile, f.copy(destfile, skip_if_older)))
 2:36.76   File "c:\Users\Admin\Documents\GitHub\UXP\python\mozbuild\mozpack\files.py", line 274, in copy
 2:36.76     strip(dest)
 2:36.76   File "c:\Users\Admin\Documents\GitHub\UXP\python\mozbuild\mozpack\executables.py", line 99, in strip
 2:36.78     if subprocess.call(cmd) != 0:
 2:36.81   File "c:\mozilla-build-3.2\python\Lib\subprocess.py", line 172, in call
 2:36.83     return Popen(*popenargs, **kwargs).wait()
 2:36.83   File "c:\mozilla-build-3.2\python\Lib\subprocess.py", line 394, in __init__
 2:36.83     errread, errwrite)
 2:36.83   File "c:\mozilla-build-3.2\python\Lib\subprocess.py", line 644, in _execute_child
 2:36.83     startupinfo)
 2:36.83 WindowsError: [Error 2] The system cannot find the file specified
 2:36.83 mozmake.EXE[2]: *** [c:/Users/Admin/Documents/GitHub/UXP/toolkit/mozapps/installer/packager.mk:41: stage-package] Error 1
 2:36.83 mozmake.EXE[2]: Leaving directory 'c:/Users/Admin/Documents/GitHub/UXP/obj-i686-pc-mingw32/application/basilisk/installer'
 2:36.83 mozmake.EXE[1]: *** [c:/Users/Admin/Documents/GitHub/UXP/toolkit/mozapps/installer/packager-uxp.mk:16: make-archive] Error 2
 2:36.83 mozmake.EXE[1]: Leaving directory 'c:/Users/Admin/Documents/GitHub/UXP/obj-i686-pc-mingw32/application/basilisk/installer'
 2:36.83 mozmake.EXE: *** [c:/Users/Admin/Documents/GitHub/UXP/application/basilisk/build.mk:9: package] Error 2
 2:36.84 mozmake.EXE: Leaving directory 'c:/Users/Admin/Documents/GitHub/UXP/obj-i686-pc-mingw32'