Use icu4c to implement <wctype.h>.

Pretty useless, because the POSIX APIs are useless for actually
internationalization, but it lets us put this to bed for good.

Bug: http://b/18492914
Test: bionic tests
Change-Id: I4dd0aff66c44b5547039be3ffea806c865b9014a
diff --git a/libc/Android.bp b/libc/Android.bp
index f326db3..cc8d8f5 100644
--- a/libc/Android.bp
+++ b/libc/Android.bp
@@ -1623,6 +1623,7 @@
     static: {
         srcs: [
             "bionic/dl_iterate_phdr_static.cpp",
+            "bionic/icu_static.cpp",
             "bionic/malloc_common.cpp",
             "bionic/libc_init_static.cpp",
         ],
@@ -1633,6 +1634,7 @@
         srcs: [
             "arch-common/bionic/crtbegin_so.c",
             "arch-common/bionic/crtbrand.S",
+            "bionic/icu.cpp",
             "bionic/malloc_common.cpp",
             "bionic/libc_init_dynamic.cpp",
             "bionic/NetdClient.cpp",