build: Remove 'u' prefix from userspace library

so user needn't link the different library because the build type change

Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>

include/nuttx/fs/fs.h

@@ -54,7 +54,7 @@
  *
  * This is only important when compiling libraries (libc or libnx) that are
  * used both by the OS (libkc.a and libknx.a) or by the applications
- * (libuc.a and libunx.a).  In that case, the correct interface must be
+ * (libc.a and libnx.a).  In that case, the correct interface must be
  * used for the build context.
  *
  * REVISIT:  In the flat build, the same functions must be used both by

include/nuttx/mqueue.h

@@ -65,7 +65,7 @@
  *
  * This is only important when compiling libraries (libc or libnx) that are
  * used both by the OS (libkc.a and libknx.a) or by the applications
- * (libuc.a and libunx.a).  In that case, the correct interface must be
+ * (libc.a and libnx.a).  In that case, the correct interface must be
  * used for the build context.
  *
  * REVISIT:  In the flat build, the same functions must be used both by
@@ -179,7 +179,7 @@ struct task_group_s;  /* Forward reference */
  *
  ****************************************************************************/
 
-int nxmq_send(mqd_t mqdes, FAR const char *msg, size_t msglen,\
+int nxmq_send(mqd_t mqdes, FAR const char *msg, size_t msglen,
               unsigned int prio);
 
 /****************************************************************************

include/nuttx/net/net.h

@@ -51,7 +51,7 @@
  *
  * This is only important when compiling libraries (libc or libnx) that are
  * used both by the OS (libkc.a and libknx.a) or by the applications
- * (libuc.a and libunx.a).  In that case, the correct interface must be
+ * (libc.a and libnx.a).  In that case, the correct interface must be
  * used for the build context.
  *
  * REVISIT:  In the flat build, the same functions must be used both by

include/nuttx/sched.h

@@ -141,7 +141,7 @@
  *
  * This is only important when compiling libraries (libc or libnx) that are
  * used both by the OS (libkc.a and libknx.a) or by the applications
- * (libuc.a and libunx.a).  In that case, the correct interface must be
+ * (libc.a and libnx.a).  In that case, the correct interface must be
  * used for the build context.
  *
  * REVISIT:  In the flat build, the same functions must be used both by

include/nuttx/semaphore.h

@@ -50,7 +50,7 @@
  *
  * This is only important when compiling libraries (libc or libnx) that are
  * used both by the OS (libkc.a and libknx.a) or by the applications
- * (libuc.a and libunx.a).  In that case, the correct interface must be
+ * (libc.a and libnx.a).  In that case, the correct interface must be
  * used for the build context.
  *
  * REVISIT:  In the flat build, the same functions must be used both by

include/nuttx/signal.h

@@ -66,7 +66,7 @@ struct sigwork_s
  *
  * This is only important when compiling libraries (libc or libnx) that are
  * used both by the OS (libkc.a and libknx.a) or by the applications
- * (libuc.a and libunx.a).  In that case, the correct interface must be
+ * (libc.a and libnx.a).  In that case, the correct interface must be
  * used for the build context.
  *
  * REVISIT:  In the flat build, the same functions must be used both by