Clean up Linux platform defaults based upon RPM suggestions.

-DNO_THREADS is now default.

build/platforms/linux-gcc/Make-platform

@@ -15,8 +15,13 @@ LDBMLIB=-lgdbm
 
 PLATFORMCFLAGS=	-Dlinux
 
-THREADS=-DPOSIX_THREADS -DREENTRANT
-THREADSLIB=-lpthread
+# not all versions of Linux support POSIX Threads
+#THREADS=-DPOSIX_THREADS -DREENTRANT
+#THREADSLIB=-lpthread
 
-# crypt(3) is in -lcrypt
-LDAP_CRYPT_LIB= -lcrypt
+# crypt(3) is in -lcrypt on some versions of Linux
+#LDAP_CRYPT_LIB= -lcrypt
+
+LDAP_SENDMAIL=/usr/sbin/sendmail
+LDAP_EDITOR=/bin/vi
+LDAP_FINGER=/usr/bin/finger