Update Makefile.am

Fix Undefined reference on :

/bin/sh ./libtool  --tag=CC   --mode=link gcc  -g -O2   -o tsplay tsplay.o libtstools.la -lresolv -lnsl -lm -lm 
libtool: link: gcc -g -O2 -o .libs/tsplay tsplay.o  ./.libs/libtstools.so -lresolv -lnsl -lm -Wl,-rpath -Wl,/usr/local/lib
tsplay.o: In function `main':
tstools/tsplay.c:828: undefined reference to `play_PS_stream'
tstools/tsplay.c:824: undefined reference to `play_TS_stream'
collect2: error: ld returned 1 exit status
make: *** [tsplay] Error 1