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

third_party/protobuf/m4/acx_check_suncc.m4

 dnl Check for the presence of the Sun Studio compiler.
 dnl If Sun Studio compiler is found, set appropriate flags.
 dnl Additionally, Sun Studio doesn't default to 64-bit by itself,
 dnl nor does it automatically look in standard Solaris places for
 dnl 64-bit libs, so we must add those options and paths to the search
 dnl paths.
 
 dnl TODO(kenton):  This is pretty hacky.  It sets CXXFLAGS, which the autoconf
 dnl docs say should never be overridden except by the user.  It also isn't
 dnl cross-compile safe.  We should fix these problems, but since I don't have
@@ skipping 24 matching lines @@
       AS_IF([test "x$ISAINFO" != "xno"],
             [isainfo_b=`${ISAINFO} -b`],
             [isainfo_b="x"])
 
       AS_IF([test "$isainfo_b" != "x"],[
 
         isainfo_k=`${ISAINFO} -k`
 
         AS_IF([test "x$ac_enable_64bit" = "xyes"],[
 
-          AC_DEFINE([SOLARIS_64BIT_ENABLED], [1], [64bit enabled])
           AS_IF([test "x$libdir" = "x\${exec_prefix}/lib"],[
            dnl The user hasn't overridden the default libdir, so we'll
            dnl the dir suffix to match solaris 32/64-bit policy
            libdir="${libdir}/${isainfo_k}"
           ])
 
           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}"
           ])
         ])
       ])
     ;;
   esac
 
 ])