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.h

@@ -34,9 +34,6 @@
 #include <elf.h>
 #include <sys/exec_elf.h>
 
-#ifdef __cplusplus
-extern "C" {
-#endif
 #include <link.h>
 
 #undef PAGE_MASK
@@ -89,8 +86,6 @@ struct r_debug
     uintptr_t r_ldbase;
 };
 
-typedef struct soinfo soinfo;
-
 #define FLAG_LINKED     0x00000001
 #define FLAG_ERROR      0x00000002
 #define FLAG_EXE        0x00000004 // The main executable
@@ -98,8 +93,7 @@ typedef struct soinfo soinfo;
 
 #define SOINFO_NAME_LEN 128
 
-struct soinfo
-{
+struct soinfo {
     char name[SOINFO_NAME_LEN];
     const Elf32_Phdr *phdr;
     int phnum;
@@ -232,8 +226,6 @@ Elf32_Sym *soinfo_find_symbol(soinfo* si, const void *addr);
 Elf32_Sym *soinfo_lookup(soinfo *si, const char *name);
 void soinfo_call_constructors(soinfo *si);
 
-#ifdef __cplusplus
-};
-#endif
+extern "C" void notify_gdb_of_libraries();
 
 #endif