Added USE_PTHREADS for the pthreads build. Deleted obsolete

macro define -D_PR_NTHREAD.

config/SunOS5.mk

@@ -155,13 +155,19 @@ endif
 
 ifeq ($(FORCE_SW_THREADS),1)
 USE_KERNEL_THREADS	= 0
+USE_PTHREADS		= 0
 endif
 
 ifeq ($(USE_KERNEL_THREADS),1)
-PORT_FLAGS		+= -D_PR_NTHREAD -D_REENTRANT
+PORT_FLAGS		+= -D_REENTRANT
 THREAD_LIB		= -lthread
 endif
 
+ifeq ($(USE_PTHREADS),1)
+PORT_FLAGS		+= -D_REENTRANT
+THREAD_LIB		= -lpthread
+endif
+
 #
 # An nm command which generates an output like:
 # archive.a:object.o: 0000003 T symbol