Use vsnprintf(3) in syslog(3).

It seemed like a clever trick to use the internal log message formatting
code in syslog(3), but on reflection that means you can't (for example)
format floating point numbers. This patch switches us over to using good
old vsnprintf(3), even though that requires us to jump through a few hoops.

There's no obvious way to unit test this, so I wrote a little program and
ran that.

(cherry-pick of b1b60c30bf321c0fc02264b953b5c16c49d34457.)

Bug: 14292866
Change-Id: I9c83500ba9cbb209b6f496067a91bf69434eeef5
Merge "Use vsnprintf(3) in syslog(3)."
syscall(3)'s return type should be long.

This doesn't require us to change any of the syscall implementations
because (a) the LP32 ones have sizeof(int) == sizeof(long) anyway,
which is how we never noticed this bug before and (b) the LP64 ones
all use a 64-bit register for the result (and for the syscall number
too).

Bug: https://code.google.com/p/android/issues/detail?id=73952
Change-Id: I9866c3579a7a94de27bfbe80ad7a822c3183c7fb
Merge "syscall(3)'s return type should be long."
Fix 'adb shell /system/bin/linker' crash

Bug: https://code.google.com/p/android/issues/detail?id=63174
Change-Id: I072290ea11109c07f277ad3dec7f44fcb7bf6aa6
Merge "Fix 'adb shell /system/bin/linker' crash"
Fix mips/mips64 build

 Add _start entry label to mips/mips64 linker begin.S

Change-Id: Idcdfc3391427b53880650798be0583a7ac022bcc
Merge "Fix mips/mips64 build"
Added a bionic systrace class and tracing to pthread_mutex.cpp.

bionic_systrace.h contains an implementation of tracing that
can be used with systrace.py and its associated viewer.  pthread_mutex
now uses this tracing to track pthread_mutex contention, which can be
enabled by using the "bionic" command line option to systrace.

Bug: 15116468
Change-Id: I30ed5b377c91ca4c36568a0e647ddf95d4e4a61a
Merge "Added a bionic systrace class and tracing to pthread_mutex.cpp."
Fix dlsym(3) to do breadth first search.

  dlsym(3) with handle != RTLD_DEFAULT|RTLD_NEXT performs
  breadth first search through the dependency tree.

Bug: 16653281
Change-Id: I017a6975d1a62abb0218a7eb59ae4deba458e324
Merge "Fix dlsym(3) to do breadth first search."
Remove declarations for things that don't exist.

The <grp.h> ones prevent gdb from building out of the box.

Change-Id: I0efbffad2215cfcd75b4d442dfc972444b51d97c
Merge "Remove declarations for things that don't exist."
Fix linkage of grantpt(3).

Also clean up the implementation of all the pty functions, add tests,
and fix the stub implementations of ttyname(3) and ttyname_r(3).

Bug: https://code.google.com/p/android/issues/detail?id=58888
Change-Id: I0fb36438cd1abf8d4e87c29415f03db9ba13c3c2
Merge "Fix linkage of grantpt(3)."
Use libunwindbacktrace for debug malloc code.

Create a method of disabling the debug allocation code paths so that
it's possible to use the libunwindbacktrace library without any
modifications.

Use this path to create and destroy the maps for the process. It's not
stricly necessary in the init code since the symbols are not modified
until after the initialize calls.

Also, remove the debug_XXX source files that doesn't need to be in libc.so.

Fix the maps reading code since it was completely broken for 64 bit.

Bug: 16408686

Change-Id: I6b02ef6ce26fdb7a59ad1029e7cbba9accceb704
Merge "Use libunwindbacktrace for debug malloc code."