Move several FreeBSD functions to OpenBSD.

There's no difference between the two BSDs for these functions, so let's go
with the majority.

Change-Id: Ic296f23153a48bed5ad152f5b31989c4e00e60bd
diff --git a/libc/Android.mk b/libc/Android.mk
index 4b98ee7..7a81bd8 100644
--- a/libc/Android.mk
+++ b/libc/Android.mk
@@ -264,12 +264,7 @@
     upstream-freebsd/lib/libc/gen/ldexp.c \
     upstream-freebsd/lib/libc/gen/sleep.c \
     upstream-freebsd/lib/libc/gen/usleep.c \
-    upstream-freebsd/lib/libc/stdlib/abs.c \
     upstream-freebsd/lib/libc/stdlib/getopt_long.c \
-    upstream-freebsd/lib/libc/stdlib/imaxabs.c \
-    upstream-freebsd/lib/libc/stdlib/imaxdiv.c \
-    upstream-freebsd/lib/libc/stdlib/labs.c \
-    upstream-freebsd/lib/libc/stdlib/llabs.c \
     upstream-freebsd/lib/libc/stdlib/qsort.c \
     upstream-freebsd/lib/libc/stdlib/quick_exit.c \
     upstream-freebsd/lib/libc/stdlib/realpath.c \
@@ -496,11 +491,16 @@
     upstream-openbsd/lib/libc/stdio/wprintf.c \
     upstream-openbsd/lib/libc/stdio/wscanf.c \
     upstream-openbsd/lib/libc/stdio/wsetup.c \
+    upstream-openbsd/lib/libc/stdlib/abs.c \
     upstream-openbsd/lib/libc/stdlib/atoi.c \
     upstream-openbsd/lib/libc/stdlib/atol.c \
     upstream-openbsd/lib/libc/stdlib/atoll.c \
     upstream-openbsd/lib/libc/stdlib/getenv.c \
     upstream-openbsd/lib/libc/stdlib/insque.c \
+    upstream-openbsd/lib/libc/stdlib/imaxabs.c \
+    upstream-openbsd/lib/libc/stdlib/imaxdiv.c \
+    upstream-openbsd/lib/libc/stdlib/labs.c \
+    upstream-openbsd/lib/libc/stdlib/llabs.c \
     upstream-openbsd/lib/libc/stdlib/lsearch.c \
     upstream-openbsd/lib/libc/stdlib/reallocarray.c \
     upstream-openbsd/lib/libc/stdlib/remque.c \