Don't build libc/pthread if pthreasa are disable. Fix a warning in dirent logic if mountpoints are disabled.

libc/pthread/Make.defs

@@ -33,6 +33,8 @@
 #
 ############################################################################
 
+ifneq ($(CONFIG_DISABLE_PTHREAD),y)
+
 # Add the pthread C files to the build
 
 CSRCS += pthread_attr_init.c pthread_attr_destroy.c
@@ -54,9 +56,6 @@ ifeq ($(CONFIG_SMP),y)
 CSRCS += pthread_attr_getaffinity.c pthread_attr_setaffinity.c
 endif
 
-ifeq ($(CONFIG_MUTEX_TYPES),y)
-endif
-
 ifeq ($(CONFIG_BUILD_PROTECTED),y)
 CSRCS += pthread_startup.c
 endif
@@ -65,3 +64,5 @@ endif
 
 DEPPATH += --dep-path pthread
 VPATH += :pthread
+
+endif