FS-5776 --resolve Update libsoundtouch to address build issues

src/mod/applications/mod_soundtouch/Makefile

 BASE=../../../..
-VERSION=soundtouch-1.6.0
+VERSION=soundtouch-1.7.1
 SNDT_SRC=$(switch_srcdir)/libs/soundtouch
 SNDT_BUILD=$(switch_builddir)/libs/soundtouch
 LA=$(SNDT_BUILD)/source/SoundTouch/.libs/libSoundTouch.a