mod_soundtouch: Update soundtouch to 1.6.0 to fix FS-3634

Error messages (on x86_64):

  {standard input}: Assembler messages:
  {standard input}:28: Error: `(%esp)' is not a valid 64 bit base/index expression
  {standard input}:31: Error: `(%esp)' is not a valid 64 bit base/index expression
  {standard input}:34: Error: `(%esp)' is not a valid 64 bit base/index expression
  gmake[8]: *** [cpu_detect_x86_gcc.lo] Error 1

This part of the CPU detection code is now skipped on x86_64.
Signed-off-by: Stefan Knoblich <stkn@openisdn.net>

src/mod/applications/mod_soundtouch/Makefile

 BASE=../../../..
-VERSION=soundtouch-1.5.0
+VERSION=soundtouch-1.6.0
 SNDT_SRC=$(switch_srcdir)/libs/soundtouch
 SNDT_BUILD=$(switch_builddir)/libs/soundtouch
 LA=$(SNDT_BUILD)/source/SoundTouch/.libs/libSoundTouch.a