Bulk convert control files. (#19986)

```
function Convert-Control {
    Param($full)
    .\vcpkg.exe format-manifest $full
    $root = $full.Substring(0, $full.Length - 7) # CONTROL
    $new = $root + 'vcpkg.json'
    $content = Get-Content -Raw $new
    $asJson = ConvertFrom-Json $content -AsHashtable -Depth 100
    $oldVersion = $asJson['port-version']
    if ($null -eq $oldVersion) {
        $oldVersionFull = $asJson['version-string']
        Write-Host "Got version $oldVersionFull"
        $match = [System.Text.RegularExpressions.Regex]::Match($oldVersionFull, '^(.+)-(\d+)$')
        if ($match.Success -and -not [System.Text.RegularExpressions.Regex]::IsMatch($oldVersionFull, '^\d\d\d\d-\d\d-\d\d$')) {
            $newFullVersion = [string]$match.Groups[1].Value
            $oldVersion = [int]$match.Groups[2].Value
            Write-Host "newFullVersion $newFullVersion oldVersion $oldVersion"
            $newVersion = $oldVersion + 1
            $asJson['version-string'] = $newFullVersion
            Write-Host "Previous version for $full extracted from version field -- setting version-string $newFullVersion and port-version $newVersion"
        } else {
            Write-Host "No previous version for $full -- setting 1"
            $newVersion = 1
        }
    } else {
        $newVersion = [int]$oldVersion + 1
        Write-Host "New version for $full : $newVersion"
    }

    $asJson['port-version'] = $newVersion

    $content = ConvertTo-Json $asJson -Depth 100
    Set-Content -Path $new -Value $content
    .\vcpkg.exe format-manifest $new
}

Get-ChildItem ports\CONTROL -Recurse | Foreach-Object {
    Convert-Control $_.FullName
}

git commit -am "this message"
.\vcpkg.exe x-add-version -all
git commit -a --amend
```

2 files changed, 14 insertions, 6 deletions

diff --git a/ports/elfutils/CONTROL b/ports/elfutils/CONTROL
deleted file mode 100644
index 8dcee64a7..000000000
--- a/ports/elfutils/CONTROL
+++ /dev/null
@@ -1,6 +0,0 @@
-Source: elfutils

-Version: 0.182

-Homepage: https://sourceware.org/elfutils/

-Description: elfutils is a collection of utilities and libraries to read, create and modify ELF binary files, find and handle DWARF debug data, symbols, thread state and stacktraces for processes and core files on GNU/Linux. 

-Build-Depends: bzip2, zlib, liblzma, zstd

-Supports: !windows

diff --git a/ports/elfutils/vcpkg.json b/ports/elfutils/vcpkg.json
new file mode 100644
index 000000000..ba686648f
--- /dev/null
+++ b/ports/elfutils/vcpkg.json
@@ -0,0 +1,14 @@
+{
+  "name": "elfutils",
+  "version-string": "0.182",
+  "port-version": 1,
+  "description": "elfutils is a collection of utilities and libraries to read, create and modify ELF binary files, find and handle DWARF debug data, symbols, thread state and stacktraces for processes and core files on GNU/Linux.",
+  "homepage": "https://sourceware.org/elfutils/",
+  "supports": "!windows",
+  "dependencies": [
+    "bzip2",
+    "liblzma",
+    "zlib",
+    "zstd"
+  ]
+}