Use void instead of no parameters in 2 function declarations.

In compiling some code with a picky "Android.mk" file, it is not happy
with a function declaration that looks like:

    void foo();

It requires:

    void foo(void);

This commit changes that for 2 functions in "log.h".

Test: Build both Android and the code with a picky "Android.mk".
Change-Id: Icd624df34db57e642fe6b1c7da77be9b05936936

liblog/include/log/log.h

@@ -161,7 +161,7 @@ typedef enum {
 #endif
 
 #if __ANDROID_USE_LIBLOG_CLOCK_INTERFACE
-clockid_t android_log_clockid();
+clockid_t android_log_clockid(void);
 #endif
 
 #endif /* __linux__ */
@@ -185,7 +185,7 @@ clockid_t android_log_clockid();
  * May be used to clean up File descriptors after a Fork, the resources are
  * all O_CLOEXEC so wil self clean on exec().
  */
-void __android_log_close();
+void __android_log_close(void);
 #endif
 
 #ifndef __ANDROID_USE_LIBLOG_RATELIMIT_INTERFACE