Remove workaround to copy reclient binaries

With Kernel caching enabled for files in Cog, we no longer need this workaround. This also makes clean builds after make clean simpler (no need to rerun source again after m clean).

Bug: b/289391270
TESTED: Ran ~5 full builds without workaround and none of them stalled

NOTE FOR REVIEWERS - original patch and result patch are not identical.
PLEASE REVIEW CAREFULLY.
Diffs between the patches:
 # This function moves the reclient binaries into a directory that exists in a
> -# non-cog part of the overall filesystem.  This is to workaround the problem
> -# described in b/289391270.
> -function _copy_reclient_binaries_from_cog() {
> -  if [[ "${OUT_DIR}" == "" ]]; then
> -    OUT_DIR="out"
> -  fi
> -  local RECLIENT_VERSION=`readlink prebuilts/remoteexecution-client/live`
> -
> -  local NONCOG_RECLIENT_BIN_DIR_BASE="${OUT_DIR}/.reclient"
> -  local NONCOG_RECLIENT_BIN_DIR="${NONCOG_RECLIENT_BIN_DIR_BASE}/${RECLIENT_VERSION}"
> -
> -  # Create the non cog directory and setup live symlink.
> -  mkdir -p ${NONCOG_RECLIENT_BIN_DIR}
> -
> -  if [ `ls ${NONCOG_RECLIENT_BIN_DIR} | wc -l` -lt 8 ]; then
> -    # Not all binaries exist, copy them from the Cog directory.
> -    local TOP=$(gettop)
> -    cp ${TOP}/prebuilts/remoteexecution-client/live/* ${NONCOG_RECLIENT_BIN_DIR}
> -  fi
> -
> -  ln -sfn ${RECLIENT_VERSION} ${NONCOG_RECLIENT_BIN_DIR_BASE}/live
> -  export RBE_DIR="${NONCOG_RECLIENT_BIN_DIR_BASE}/live"
> -}
> -
> -  _copy_reclient_binaries_from_cog

Original patch:
 diff --git a/cogsetup.sh b/cogsetup.sh
old mode 100644
new mode 100644
--- a/cogsetup.sh
+++ b/cogsetup.sh
@@ -34,31 +34,6 @@
   mkdir -p ${DEFAULT_OUTPUT_DIR}
   ln -s ${DEFAULT_OUTPUT_DIR} `pwd`/out
 }
-
-# This function moves the reclient binaries into a directory that exists in a
-# non-cog part of the overall filesystem.  This is to workaround the problem
-# described in b/289391270.
-function _copy_reclient_binaries_from_cog() {
-  if [[ "${OUT_DIR}" == "" ]]; then
-    OUT_DIR="out"
-  fi
-  local RECLIENT_VERSION=`readlink prebuilts/remoteexecution-client/live`
-
-  local NONCOG_RECLIENT_BIN_DIR_BASE="${OUT_DIR}/.reclient"
-  local NONCOG_RECLIENT_BIN_DIR="${NONCOG_RECLIENT_BIN_DIR_BASE}/${RECLIENT_VERSION}"
-
-  # Create the non cog directory and setup live symlink.
-  mkdir -p ${NONCOG_RECLIENT_BIN_DIR}
-
-  if [ `ls ${NONCOG_RECLIENT_BIN_DIR} | wc -l` -lt 8 ]; then
-    # Not all binaries exist, copy them from the Cog directory.
-    local TOP=$(gettop)
-    cp ${TOP}/prebuilts/remoteexecution-clie
[[[Original patch trimmed due to size. Decoded string size: 1502. Decoded string SHA1: f5a824559440a15a8ccb76dbf414facf5d578da9.]]]

Result patch:
 diff --git a/cogsetup.sh b/cogsetup.sh
index 3005d58..6439af0 100644
--- a/cogsetup.sh
+++ b/cogsetup.sh
@@ -35,31 +35,6 @@
   ln -s ${DEFAULT_OUTPUT_DIR} `pwd`/out
 }
 
-# This function moves the reclient binaries into a directory that exists in a
-# non-cog part of the overall filesystem.  This is to workaround the problem
-# described in b/289391270.
-function _copy_reclient_binaries_from_cog() {
-  if [[ "${OUT_DIR}" == "" ]]; then
-    OUT_DIR="out"
-  fi
-  local RECLIENT_VERSION=`readlink prebuilts/remoteexecution-client/live`
-
-  local NONCOG_RECLIENT_BIN_DIR_BASE="${OUT_DIR}/.reclient"
-  local NONCOG_RECLIENT_BIN_DIR="${NONCOG_RECLIENT_BIN_DIR_BASE}/${RECLIENT_VERSION}"
-
-  # Create the non cog directory and setup live symlink.
-  mkdir -p ${NONCOG_RECLIENT_BIN_DIR}
-
-  if [ `ls ${NONCOG_RECLIENT_BIN_DIR} | wc -l` -lt 8 ]; then
-    # Not all binaries exist, copy them from the Cog directory.
-    local TOP=$(gettop)
-    cp ${TOP}/prebuilts/remoteexecution-client/live/* ${NONCOG_RECLIENT_BIN_DIR}
[[[Result patch trimmed due to size. Decoded string size: 1500. Decoded string SHA1: 75090baaf2a80305e8faea0e882e7edf257a2420.]]]

Change-Id: Id9963c3f1de7d3d4151a2e84fe52cf9d2f66ba10