NaCl: Fix ARM Gyp build of IRT to include IRT-private __aeabi_read_tp

ppapi/native_client/native_client.gyp

Index: ppapi/native_client/native_client.gyp
diff --git a/ppapi/native_client/native_client.gyp b/ppapi/native_client/native_client.gyp
index 8a94c3abcbf8df6c8860e10c195d3362094277a0..be2e727fccfa3e8908ffc2e57b4c85aa44de8e23 100644
--- a/ppapi/native_client/native_client.gyp
+++ b/ppapi/native_client/native_client.gyp
@@ -108,11 +108,20 @@
             'conditions': [
               ['target_arch!="arm"',
                {
+                 'sources': [
+                 ],
                  'link_flags': [
                    '-Wl,--section-start,.rodata=<(NACL_IRT_DATA_START)',
                    '-Wl,-Ttext-segment=<(NACL_IRT_TEXT_START)',
                  ]
                }, { # target_arch == "arm"
+                 # TODO(mcgrathr): This knowledge really belongs in
+                 # native_client/src/untrusted/irt/irt.gyp instead of here.
+                 # But that builds libirt_browser.a as bitcode, so a native
+                 # object does not fit happily there.
+                 'sources': [
+                   '../../native_client/src/untrusted/irt/aeabi_read_tp.S',
+                 ],
                  'link_flags': [
                    '-Wl,--section-start,.rodata=<(NACL_IRT_DATA_START)',
                    '-Wl,-Ttext=<(NACL_IRT_TEXT_START)',
@@ -123,8 +132,6 @@
                },
              ],
             ],
-            'sources': [
-            ],
             'extra_args': [
               '--strip-debug',
             ],