build/windows: Make Inno auto repairing finally work

Partially revert f0fb4435

It is safer to wait for Inno to compile successfully before deleting the
.bak langs, which are the condition to auto repairing.

build/windows/installer/3_dist-gimp-inno.ps1

@@ -33,7 +33,6 @@ if ("$broken_inno" -or "$inno_version" -ne "$inno_version_downloaded")
     if ("$broken_inno")
       {
         Write-Output '(INFO): repairing Inno'
-        $broken_inno | Remove-Item -Recurse
       }
     elseif ("$inno_version" -notlike "*.*")
       {
@@ -225,6 +224,11 @@ if ($CUSTOM_GIMP_VERSION -match 'RC[1-9]')
     $devel_warning='-DDEVEL_WARNING'
   }
 iscc -DCUSTOM_GIMP_VERSION="$CUSTOM_GIMP_VERSION" -DGIMP_VERSION="$gimp_version" -DREVISION="$revision" -DGIMP_APP_VERSION="$gimp_app_version" -DGIMP_API_VERSION="$gimp_api_version" -DBUILD_DIR="$BUILD_DIR" -DGIMP_DIR="$GIMP_BASE" -DDIR32="$GIMP32" -DDIR64="$GIMP64" -DDIRA64="$GIMPA64" -DDEPS_DIR="$GIMP_BASE" -DDDIR32="$GIMP32" -DDDIR64="$GIMP64" -DDDIRA64="$GIMPA64" -DDEBUG_SYMBOLS -DPYTHON $devel_warning base_gimp3264.iss | Out-Null
+if ("$LASTEXITCODE" -gt '0' -or "$?" -eq 'False')
+  {
+    ## We need to manually check failures in pre-7.4 PS
+    exit 1
+  }
 Set-Location $GIMP_BASE
 Write-Output "$([char]27)[0Ksection_end:$(Get-Date -UFormat %s -Millisecond 0):installer_making$([char]13)$([char]27)[0K"