Always install libpthread.* symlinks if at least one of

the threading libraries is built.  This simplifies the
logic in makefiles that need to check if the pthreads
support is present.  It also fixes a bug where we would
build a threading library that we shouldn't have built:
for example, building with WITHOUT_LIBTHR and the default
value of DEFAULT_THREADING_LIB (libthr) would mistakenly
build the libthr library, but not install it.

Approved by:	re (kensmith)

Makefile

@@ -6,8 +6,7 @@ SUBDIR=	${_ggatec} \
 	${_ggated} \
 	ggatel
 
-.if ${MK_LIBTHR} != "no" || \
-    (${MACHINE_ARCH} != "sparc64" && ${MK_LIBPTHREAD} != "no")   
+.if ${MK_LIBTHR} != "no" || ${MK_LIBPTHREAD} != "no"
 _ggatec=	ggatec
 _ggated=	ggated
 .endif