Switch from using 'nacl_main' to 'main' entry point

ports/git/build.sh

 # Copyright (c) 2013 The Native Client Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 EXECUTABLES="git git-remote-http git-remote-https"
 
 BUILD_DIR=${SRC_DIR}
-export EXTLIBS="${NACL_CLI_MAIN_LIB}"
 
 if [ "${NACL_SHARED}" != "1" ]; then
   # These are needed so that the configure can detect libcurl when statically
   # linked.
   NACLPORTS_LIBS+=" -lcurl -lssl -lcrypto -lz"
 fi
 
 if [ ${OS_NAME} = "Darwin" ]; then
   # gettext (msgfmt) doesn't exist on darwin by default.  homebrew installs
   # it to /usr/local/opt/gettext, and we need it to be in the PATH when
   # building git
   export PATH=${PATH}:/usr/local/opt/gettext/bin
 fi
 
 if [ "${NACL_LIBC}" = "newlib" ]; then
   export NO_RT_LIBRARY=1
-  EXTLIBS+=" -lglibc-compat"
 fi
 export CROSS_COMPILE=1
 export NEEDS_CRYPTO_WITH_SSL=YesPlease
 
+EnableCliMain
 EnableGlibcCompat
 
 ConfigureStep() {
   NACLPORTS_CPPFLAGS+=" -Dpipe=nacl_spawn_pipe"
   autoconf
 
   if [ "${NACL_LIBC}" = "glibc" ]; then
     # Because libcrypto.a needs dlsym we need to add this explicitly.
     # This is not normally needed when libcyrpto is a shared library.
-    NACLPORTS_LDFLAGS+=" -ldl"
+    NACLPORTS_LIBS+=" -ldl"
   fi
 
   DefaultConfigureStep
 }
 
 BuildStep() {
   SetupCrossEnvironment
   export CCLD=${CXX}
+  export EXTLIBS=${LIBS}
   # Git's build doesn't support building outside the source tree.
   # Do a clean to make rebuild after failure predictable.
   LogExecute make clean
   DefaultBuildStep
 }
 
 InstallStep() {
   SetupCrossEnvironment
   export CCLD=${CXX}
+  export EXTLIBS=${LIBS}
   DefaultInstallStep
   # Remove some of the git symlinks to save some space (since symlinks are
   # currnely only supported via file copying).
   for f in ${DESTDIR}${PREFIX}/libexec/git-core/*; do
     if [ -L $f ]; then
       Remove $f
     fi
   done
 }