Enable shared library on android

This change fixed link errors in building shared library
for android. crtbegin_so.o is added to resolve dso_handle
and exclude-libs option is removed for shared library.

Review URL: https://chromiumcodereview.appspot.com/11262003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@12806 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

AUTHORS

@@ -53,6 +53,7 @@ Sanjoy Das <sanjoy@playingwithpointers.com>
 Subrato K De <subratokde@codeaurora.org>
 Tobias Burnus <burnus@net-b.de>
 Vlad Burlik <vladbph@gmail.com>
+Xi Qian <xi.qian@intel.com>
 Yuqiang Xian <yuqiang.xian@intel.com>
 Zaheer Ahmad <zahmad@codeaurora.org>
 Zhongping Wang <kewpie.w.zp@gmail.com>

build/android.gypi

@@ -122,8 +122,6 @@
         'ldflags': [
           '-nostdlib',
           '-Wl,--no-undefined',
-          # Don't export symbols from statically linked libraries.
-          '-Wl,--exclude-libs=ALL',
         ],
         'libraries!': [
             '-lrt',  # librt is built into Bionic.
@@ -219,6 +217,13 @@
           ['_type=="shared_library"', {
             'ldflags': [
               '-Wl,-shared,-Bsymbolic',
+              '<(android_lib)/crtbegin_so.o',
+            ],
+          }],
+          ['_type=="static_library"', {
+            'ldflags': [
+              # Don't export symbols from statically linked libraries.
+              '-Wl,--exclude-libs=ALL',
             ],
           }],
         ],