ndk: API level 12: Add ARM libc symbol files

Extracted from the tervigon build for android-3.1_r1 a.k.a. HMJ37

Change-Id: Idd914b3a4879174f98569b3a9bbb6cf3d48ef221

ndk/platforms/android-12/arch-arm/symbols/libc.so.variables.txt

@@ -0,0 +1,44 @@
+_C_ctype_
+_C_tolower_
+_C_toupper_
+__atexit
+__atexit_invalid
+__bionic_brk
+__evOptMonoTime
+__isthreaded
+__libc_malloc_default_dispatch
+__libc_malloc_dispatch
+__p_cert_syms
+__p_class_syms
+__p_key_syms
+__p_rcode_syms
+__p_type_syms
+__page_shift
+__page_size
+__popcount_tab
+__progname
+__rand48_add
+__rand48_mult
+__rand48_seed
+__sF
+__sdidinit
+__sglue
+__stack_chk_guard
+__system_property_area__
+_ctype_
+_ns_flagdata
+_tolower_tab_
+_toupper_tab_
+daylight
+environ
+h_errlist
+h_nerr
+optarg
+opterr
+optind
+optopt
+optreset
+sys_siglist
+sys_signame
+timezone
+tzname