Remove leading _ from header inclusion guards

Identifiers starting with underscore followed by uppercase letter
are reserved identifiers (ex. C99 7.1.3).

src/cfu.h

@@ -35,8 +35,8 @@
  * OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifndef _LIBCFU_H_
-#define _LIBCFU_H_
+#ifndef LIBCFU_H_
+#define LIBCFU_H_
 
 #ifdef __cplusplus
 #define CFU_BEGIN_DECLS extern "C" {

src/cfuconf.h

@@ -35,8 +35,8 @@
  * OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifndef _CFU_CONF_H_
-#define _CFU_CONF_H_
+#ifndef CFU_CONF_H_
+#define CFU_CONF_H_
 
 #include <cfu.h>
 #include <cfuhash.h>

src/cfuhash.h

@@ -35,8 +35,8 @@
  * OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifndef _CFU_HASH_H_
-#define _CFU_HASH_H_
+#ifndef CFU_HASH_H_
+#define CFU_HASH_H_
 
 #include <cfu.h>
 #include <stdio.h>

src/cfulist.h

@@ -35,8 +35,8 @@
  * OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifndef _CFU_LIST_
-#define _CFU_LIST_
+#ifndef CFU_LIST_
+#define CFU_LIST_
 
 #include <cfu.h>
 #include <stddef.h>

src/cfuopt.h

@@ -37,8 +37,8 @@
 
 #include <cfu.h>
 
-#ifndef _CFU_OPT_H_
-#define _CFU_OPT_H_
+#ifndef CFU_OPT_H_
+#define CFU_OPT_H_
 
 CFU_BEGIN_DECLS
 

src/cfustring.h

@@ -35,8 +35,8 @@
  * OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifndef _CFU_STRING_H_
-#define _CFU_STRING_H_
+#ifndef CFU_STRING_H_
+#define CFU_STRING_H_
 
 #include <cfu.h>
 #include <stdarg.h>

src/cfuthread_queue.h

@@ -35,8 +35,8 @@
  * OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifndef _CFUTHREAD_QUEUE_H
-#define _CFUTHREAD_QUEUE_H
+#ifndef CFUTHREAD_QUEUE_H
+#define CFUTHREAD_QUEUE_H
 
 #include <cfu.h>
 

src/cfutime.h

@@ -35,8 +35,8 @@
  * OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifndef _CFU_TIME_H_
-#define _CFU_TIME_H_
+#ifndef CFU_TIME_H_
+#define CFU_TIME_H_
 
 #include <cfu.h>