Allow old PEAR/PECL named convention packages for pre-packaged source

src/Platform/PrePackagedSourceAssetName.php

@@ -21,6 +21,7 @@ private function __construct()
     public static function packageNames(Package $package): array
     {
         return [
+            // Ideal format for new PIE packages
             strtolower(sprintf(
                 'php_%s-%s-src.tgz',
                 $package->extensionName()->name(),
@@ -31,6 +32,12 @@ public static function packageNames(Package $package): array
                 $package->extensionName()->name(),
                 $package->version(),
             )),
+            // Old PEAR/PECL convention
+            strtolower(sprintf(
+                '%s-%s.tgz',
+                $package->extensionName()->name(),
+                $package->version(),
+            )),
         ];
     }
 }

test/unit/Downloading/DownloadUrlMethodTest.php

@@ -90,6 +90,7 @@ public function testPrePackagedSourceDownloads(): void
             [
                 'php_bar-1.2.3-src.tgz',
                 'php_bar-1.2.3-src.zip',
+                'bar-1.2.3.tgz',
             ],
             $downloadUrlMethod->possibleAssetNames($package, $targetPlatform),
         );

test/unit/Platform/PrePackagedSourceAssetNameTest.php

@@ -21,6 +21,7 @@ public function testPackageNames(): void
             [
                 'php_foobar-1.2.3-src.tgz',
                 'php_foobar-1.2.3-src.zip',
+                'foobar-1.2.3.tgz',
             ],
             PrePackagedSourceAssetName::packageNames(
                 new Package(