Update third_party/protobuf to protobuf-v3.0.0-beta-3

third_party/protobuf/m4/acx_check_suncc.m4

Index: third_party/protobuf/m4/acx_check_suncc.m4
diff --git a/third_party/protobuf/m4/acx_check_suncc.m4 b/third_party/protobuf/m4/acx_check_suncc.m4
index 89185932b25fdb871c291873560f4cd743757169..8bc0a890dc2576450b4820e3028f892114b67a9a 100644
--- a/third_party/protobuf/m4/acx_check_suncc.m4
+++ b/third_party/protobuf/m4/acx_check_suncc.m4
@@ -42,7 +42,6 @@ AC_DEFUN([ACX_CHECK_SUNCC],[
 
         AS_IF([test "x$ac_enable_64bit" = "xyes"],[
 
-          AC_DEFINE([SOLARIS_64BIT_ENABLED], [1], [64bit enabled])
           AS_IF([test "x$libdir" = "x\${exec_prefix}/lib"],[
            dnl The user hasn't overridden the default libdir, so we'll
            dnl the dir suffix to match solaris 32/64-bit policy
@@ -52,17 +51,13 @@ AC_DEFUN([ACX_CHECK_SUNCC],[
           dnl This should just be set in CPPFLAGS and in LDFLAGS, but libtool
           dnl does the wrong thing if you don't put it into CXXFLAGS. sigh.
           dnl (It also needs it in CFLAGS, or it does a different wrong thing!)
-          AS_IF([test "x${ac_cv_env_CXXFLAGS_set}" = "x"],[
-            CXXFLAGS="${CXXFLAGS} -m64"
-            ac_cv_env_CXXFLAGS_set=set
-            ac_cv_env_CXXFLAGS_value='-m64'
-          ])
+          CXXFLAGS="${CXXFLAGS} -m64"
+          ac_cv_env_CXXFLAGS_set=set
+          ac_cv_env_CXXFLAGS_value='-m64'
 
-          AS_IF([test "x${ac_cv_env_CFLAGS_set}" = "x"],[
-            CFLAGS="${CFLAGS} -m64"
-            ac_cv_env_CFLAGS_set=set
-            ac_cv_env_CFLAGS_value='-m64'
-          ])
+          CFLAGS="${CFLAGS} -m64"
+          ac_cv_env_CFLAGS_set=set
+          ac_cv_env_CFLAGS_value='-m64'
 
           AS_IF([test "$target_cpu" = "sparc" -a "x$SUNCC" = "xyes" ],[
             CXXFLAGS="-xmemalign=8s ${CXXFLAGS}"