Remove dependency on libc.a from the linker

Provide stub for unused but needed symbol __find_icu_symbol
which is not included to libc_nomalloc.a.

Test: mm and boot
Change-Id: I57ca09c990556d1d401e2f4a75bc49b61b4cd85d
diff --git a/linker/Android.bp b/linker/Android.bp
index 6d93571..5c205d5 100644
--- a/linker/Android.bp
+++ b/linker/Android.bp
@@ -22,6 +22,7 @@
         "linker_gdb_support.cpp",
         "linker_globals.cpp",
         "linker_libc_support.c",
+        "linker_libcxx_support.cpp",
         "linker_main.cpp",
         "linker_namespaces.cpp",
         "linker_logger.cpp",
@@ -111,6 +112,7 @@
 
     static_libs: [
         "libc_nomalloc",
+        "libm",
         "libziparchive",
         "libutils",
         "libbase",