gn2bp: Convert `source_set` with rtti to static_libraries

* `source_set` were converted to cc_defaults and this would pose a huge problem if those cc_defaults had rtti on since it affected all of the dependencies of the source target.
* The solution here would be to compile the `source_set` independently as a static/shared library with rtti on then link it.

Test: m cronet_aml_components_cronet_android_cronet
Change-Id: I28bbe0947d0dc87c2d602514a2759a3171b68aa2
diff --git a/tools/gn2bp/gen_android_bp b/tools/gn2bp/gen_android_bp
index 3d98ce6..70e4466 100755
--- a/tools/gn2bp/gen_android_bp
+++ b/tools/gn2bp/gen_android_bp
@@ -127,9 +127,6 @@
             'cronet_aml_net_third_party_quiche_quiche',
             'cronet_aml_crypto_crypto',
         }),
-        # When a code is compiled under rtti(cronet) that depends on another code(net)
-        # that doesn't depend on rtti. undefined symbol: typeinfo 'class' errors appears.
-        ('rtti', True), # go/undefined-symbol-typeinfo
     ],
 }
 
@@ -967,8 +964,6 @@
   for flag in cflags:
     if '-std=' in flag:
       module.cpp_std = flag[len('-std='):]
-    if '-frtti' in flag:
-      module.rtti = True
     if '-fexceptions' in flag:
       module.cppflags.add('-fexceptions')
 
@@ -1072,6 +1067,8 @@
       for src in arch.sources
       if is_supported_source_file(src) and not src.startswith("//out/test"))
 
+  module.rtti = target.rtti
+
   if target.type in gn_utils.LINKER_UNIT_TYPES:
     set_module_flags(module, target.cflags, target.defines)
     set_module_include_dirs(module, target.cflags, target.include_dirs)