No need for gcc thread stuff anymore, only cc.

Author: bmomjian

src/template/unixware

@@ -1,6 +1,5 @@
-if test "$GCC" = yes; then
-  PTHREAD_CFLAGS="-pthread"
-else
+if test "$GCC" != yes; then
+then
   # The -Kno_host is for a bug in the compiler.  See -hackers
   # discussion on 7-8/Aug/2003.
   cat >conftest.c <<__EOF__