Export RTTI symbols from liblo-native-code.so, for binary UNO bridge

This will become important when switching armeabi-v7a to
libc++/libc++abi/libunwind (coming soon) which uses address instead of string
comparison when checking for type equality, so that exceptions thrown from the
binary UNO bridge will need to use the exact same RTTI objects as referenced
from the compiled catch clauses.

Change-Id: If8bcb39212b5f5e154aee215cb5f471fe2dc4a7b
Reviewed-on: https://gerrit.libreoffice.org/64965
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

android/Bootstrap/version.map

@@ -2,6 +2,7 @@ dummy {
      global:
         Java_*;
         JNI_OnLoad;
+        _ZTI*; _ZTS*; # weak RTTI symbols for C++ exceptions
     local:
         *;
 };

bridges/source/cpp_uno/gcc3_linux_arm/except.cxx

@@ -148,9 +148,6 @@ namespace CPPU_CURRENT_NAMESPACE
             rtti = (type_info *)dlsym( m_hApp, symName.getStr() );
 #else
             rtti = (type_info *)dlsym( RTLD_DEFAULT, symName.getStr() );
-            // Unfortunately dlsym for weak symbols doesn't work in
-            // Android 4.0 at least, sigh, so we will always take the
-            // else branch below.
 #endif
 
             if (rtti)