More dynamic linker cleanup.

I still want to break linker_format out into its own library so we can reuse
it for malloc debugging and so forth. (There are many similar pieces of code
in bionic, but the linker's one seems to be the most complete/functional.)

Change-Id: If3721853d28937c8e821ca1d23cf200e228a409a

linker/linker_format.h

@@ -25,25 +25,17 @@
  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  */
+
 #ifndef _LINKER_FORMAT_H
 #define _LINKER_FORMAT_H
 
 #include <stdarg.h>
 #include <stddef.h>
 
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-/* Formatting routines for the dynamic linker's debug traces */
-/* We want to avoid dragging the whole C library fprintf()   */
-/* implementation into the dynamic linker since this creates */
-/* issues (it uses malloc()/free()) and increases code size  */
-
+// Formatting routines for the dynamic linker's debug traces
+// We want to avoid dragging the whole C library fprintf()
+// implementation into the dynamic linker since this creates
+// issues (it uses malloc()/free()) and increases code size.
 int format_buffer(char *buffer, size_t bufsize, const char *format, ...);
 
-#ifdef __cplusplus
-};
-#endif
-
 #endif /* _LINKER_FORMAT_H */