fix: handle older VC redist versions (#5447)

.CI/build-installer.ps1

@@ -42,7 +42,7 @@ $VCRTVersion = (Get-Item "$Env:VCToolsRedistDir\vc_redist.x64.exe").VersionInfo;
 ISCC `
     /DWORKING_DIR="$($pwd.Path)\" `
     /DINSTALLER_BASE_NAME="$installerBaseName" `
-    /DSHIPPED_VCRT_BUILD="$($VCRTVersion.FileBuildPart)" `
+    /DSHIPPED_VCRT_MINOR="$($VCRTVersion.FileMinorPart)" `
     /DSHIPPED_VCRT_VERSION="$($VCRTVersion.FileDescription)" `
     $defines `
     /O. `

.CI/chatterino-installer.iss

@@ -120,15 +120,15 @@ begin
     Result := VCRTVersion + ' is installed';
 end;
 
-// Checks if a new VCRT is needed by comparing the builds.
+// Checks if a new VCRT is needed by comparing the minor version (the major one is locked at 14).
 function NeedsNewVCRT(): Boolean;
 var
   VCRTBuild: Cardinal;
 begin
   Result := True;
-  if RegQueryDWordValue(HKEY_LOCAL_MACHINE, 'SOFTWARE\Microsoft\VisualStudio\14.0\VC\Runtimes\x64', 'Bld', VCRTBuild) then
+  if RegQueryDWordValue(HKEY_LOCAL_MACHINE, 'SOFTWARE\Microsoft\VisualStudio\14.0\VC\Runtimes\x64', 'Minor', VCRTBuild) then
   begin
-    if VCRTBuild >= {#SHIPPED_VCRT_BUILD} then
+    if VCRTBuild >= {#SHIPPED_VCRT_MINOR} then
         Result := False;
   end;
 end;

.CI/deploy-crt.ps1

@@ -0,0 +1,30 @@
+param (
+    [string] $InstallDir = "Chatterino2"
+)
+
+if ($null -eq $Env:VCToolsRedistDir) {
+    Write-Error "VCToolsRedistDir is not set. Forgot to set Visual Studio environment variables?";
+    exit 1
+}
+
+# A path to the runtime libraries (e.g. "$Env:VCToolsRedistDir\onecore\x64\Microsoft.VC143.CRT")
+$vclibs = (Get-ChildItem "$Env:VCToolsRedistDir\onecore\x64" -Filter '*.CRT')[0].FullName;
+
+# All executables and libraries in the installation directory
+$targets = Get-ChildItem -Recurse -Include '*.dll', '*.exe' $InstallDir;
+# All dependencies of the targets (with duplicates)
+$all_deps = $targets | ForEach-Object { (dumpbin /DEPENDENTS $_.FullName) -match '^(?!Dump of).+\.dll$' } | ForEach-Object { $_.Trim() };
+# All dependencies without duplicates
+$dependencies = $all_deps | Sort-Object -Unique;
+
+$n_deployed = 0;
+foreach ($dll in $dependencies) {
+    Write-Output "Checking for $dll";
+    if (Test-Path -PathType Leaf "$vclibs\$dll") {
+        Write-Output "Deploying $dll";
+        Copy-Item "$vclibs\$dll" "$InstallDir\$dll" -Force;
+        $n_deployed++;
+    }
+}
+
+Write-Output "Deployed $n_deployed libraries";