liblog: remove checks for __GNUC__

We already assume this in many other parts of the build.

Test: build
Change-Id: Ie685e83963eac942d0d176bb2394b5d3a5b86cac
diff --git a/liblog/include/android/log.h b/liblog/include/android/log.h
index 935590d..2e6210e 100644
--- a/liblog/include/android/log.h
+++ b/liblog/include/android/log.h
@@ -96,20 +96,14 @@
  * [printf(3)](http://man7.org/linux/man-pages/man3/printf.3.html).
  */
 int __android_log_print(int prio, const char* tag, const char* fmt, ...)
-#if defined(__GNUC__)
-    __attribute__((__format__(printf, 3, 4)))
-#endif
-    ;
+    __attribute__((__format__(printf, 3, 4)));
 
 /**
  * Equivalent to `__android_log_print`, but taking a `va_list`.
  * (If `__android_log_print` is like `printf`, this is like `vprintf`.)
  */
 int __android_log_vprint(int prio, const char* tag, const char* fmt, va_list ap)
-#if defined(__GNUC__)
-    __attribute__((__format__(printf, 3, 0)))
-#endif
-    ;
+    __attribute__((__format__(printf, 3, 0)));
 
 /**
  * Writes an assertion failure to the log (as `ANDROID_LOG_FATAL`) and to
@@ -127,13 +121,8 @@
  * including the source filename and line number more conveniently than this
  * function.
  */
-void __android_log_assert(const char* cond, const char* tag, const char* fmt,
-                          ...)
-#if defined(__GNUC__)
-    __attribute__((__noreturn__))
-    __attribute__((__format__(printf, 3, 4)))
-#endif
-    ;
+void __android_log_assert(const char* cond, const char* tag, const char* fmt, ...)
+    __attribute__((__noreturn__)) __attribute__((__format__(printf, 3, 4)));
 
 #ifndef log_id_t_defined
 #define log_id_t_defined
@@ -171,8 +160,7 @@
  *
  * Apps should use __android_log_write() instead.
  */
-int __android_log_buf_write(int bufID, int prio, const char* tag,
-                            const char* text);
+int __android_log_buf_write(int bufID, int prio, const char* tag, const char* text);
 
 /**
  * Writes a formatted string to log buffer `id`,
@@ -182,12 +170,8 @@
  *
  * Apps should use __android_log_print() instead.
  */
-int __android_log_buf_print(int bufID, int prio, const char* tag,
-                            const char* fmt, ...)
-#if defined(__GNUC__)
-    __attribute__((__format__(printf, 4, 5)))
-#endif
-    ;
+int __android_log_buf_print(int bufID, int prio, const char* tag, const char* fmt, ...)
+    __attribute__((__format__(printf, 4, 5)));
 
 #ifdef __cplusplus
 }