Add missing <complex.h> functions.

FreeBSD doesn't seem interested in having low-quality implementations of
these functions:

  cacoshl, cacosl, casinhl, casinl, catanhl, catanl, ccoshl, ccosl, cexpl,
  clog, clogf, clogl, cpow, cpowf, cpowl, csinhl, csinl, ctanhl, ctanl.

And they still haven't got round to writing good implementations, so for
now let's just take the NetBSD ones so we have the full set.

Bug: http://b/27555792
Change-Id: I6b72003cf749b1043f006377a01fffe5e1d659bc
diff --git a/libm/libm.map.txt b/libm/libm.map.txt
index d273603..66dfd19 100644
--- a/libm/libm.map.txt
+++ b/libm/libm.map.txt
@@ -271,6 +271,29 @@
     *;
 };
 
+LIBC_O {
+  global:
+    cacoshl;
+    cacosl;
+    casinhl;
+    casinl;
+    catanhl;
+    catanl;
+    ccoshl;
+    ccosl;
+    cexpl;
+    clog;
+    clogf;
+    clogl;
+    cpow;
+    cpowf;
+    cpowl;
+    csinhl;
+    csinl;
+    ctanhl;
+    ctanl;
+} LIBC;
+
 LIBC_DEPRECATED { # arm mips
   global: # arm mips
     ___Unwind_Backtrace; # arm
@@ -374,4 +397,4 @@
     _Unwind_VRS_Pop; # arm
     _Unwind_VRS_Set; # arm
     restore_core_regs; # arm
-} LIBC; # arm mips
+} LIBC_O; # arm mips