small tweaks to cmake_build

- streamline how we define $here
  - only make `cmake` when bootstrapping; it's a little less to build

BUG=skia:4269
CQ_EXTRA_TRYBOTS=client.skia.compile:Build-Mac10.9-Clang-x86_64-Release-CMake-Trybot,Build-Ubuntu-GCC-x86_64-Release-CMake-Trybot

Review URL: https://codereview.chromium.org/1345663004

cmake/cmake_build

@@ -10,12 +10,7 @@
 set -e
 set -x
 
-fulldir() {
-    cd `dirname $1`
-    echo `pwd`
-}
-
-here=`fulldir $0`
+here=$(cd `dirname $0`; echo `pwd`)
 cores=32
 
 if [[ -z "$BUILDTYPE" || -z "$SKIA_OUT" ]]; then
@@ -27,7 +22,7 @@ fi
 echo "Bootstrapping CMake"
 pushd $here/../third_party/externals/cmake
 ./bootstrap --parallel=$cores
-make -j $cores
+make -j $cores cmake
 popd
 
 echo "Building with bootstrapped CMake"