linker: get rid of the buddy allocator

Currently, the Android linker is placing shared libraries into
a well-known spot in memory.  This is interfering with the kernel's
ASLR support.

This change stops forcing non-prelinked libraries into a particular
address space.

Also, get rid of FLAG_PRELINKED.  As best I can tell, this flag
is never used.

Change-Id: I527af12fb54f821c2b5ca7693dbf63d022f8f4ae

linker/linker.h

@@ -83,7 +83,6 @@ typedef struct soinfo soinfo;
 #define FLAG_LINKED     0x00000001
 #define FLAG_ERROR      0x00000002
 #define FLAG_EXE        0x00000004 // The main executable
-#define FLAG_PRELINKED  0x00000008 // This is a pre-linked lib
 
 #define SOINFO_NAME_LEN 128
 
@@ -95,8 +94,6 @@ struct soinfo
     unsigned entry;
     unsigned base;
     unsigned size;
-    // buddy-allocator index, negative for prelinked libraries
-    int ba_index;
 
     unsigned *dynamic;
 
@@ -154,17 +151,6 @@ struct soinfo
 
 extern soinfo libdl_info;
 
-/* these must all be powers of two */
-#ifdef ARCH_SH
-#define LIBBASE 0x60000000
-#define LIBLAST 0x70000000
-#define LIBINC  0x00100000
-#else
-#define LIBBASE 0x80000000
-#define LIBLAST 0x90000000
-#define LIBINC  0x00100000
-#endif
-
 #ifdef ANDROID_ARM_LINKER
 
 #define R_ARM_COPY       20