Set install_location arch specific (dotnet#59441)

Also don't write to paths when running translated (rosetta)

Author: ericstj

src/installer/pkg/sfx/installers/osx_scripts/host/postinstall

@@ -6,21 +6,19 @@
 
 PACKAGE=$1
 INSTALL_DESTINATION=$2
+[ "${InstallerTargetArchitecture}" == "x64" ] && X64_INSTALL_DESTINATION=$2 || X64_INSTALL_DESTINATION=$2/x64
 
 # A temporary fix for the permissions issue(s)
 chmod 755 $INSTALL_DESTINATION/dotnet
 
-if [ -e /etc/dotnet/install_location ]; then
-    # clear out any entries for this architecture if they exist
-    sed -i old '/^${InstallerTargetArchitecture}=/d' /etc/dotnet/install_location
-else
-    mkdir -p /etc/dotnet    
-fi
-
-echo ${InstallerTargetArchitecture}=$INSTALL_DESTINATION | tee -a /etc/dotnet/install_location
+mkdir -p /etc/dotnet
+# set install_location (legacy location) to x64 location (regardless of wether or not we're installing x64)
+echo $X64_INSTALL_DESTINATION | tee /etc/dotnet/install_location
+# set install_location_arch to point to this installed location
+echo $INSTALL_DESTINATION | tee /etc/dotnet/install_location_${InstallerTargetArchitecture}
 
 # if we're running on the native architecture
-if [[ "$(uname -m)" =~ "${UnameMachineRegex}" ]]; then
+if [[ "$(uname -m)" =~ ${UnameMachineRegex} && "$(sysctl -i -n sysctl.proc_translated)" != "1" ]]; then
     # Add the installation directory to the system-wide paths
     # But first create the directory if it doesn't exist
     mkdir -p /etc/paths.d