extract shared-only extensions into their own folder

config/pkg/ext/ext-mysqlnd_ed25519.yml

@@ -4,6 +4,7 @@ ext-mysqlnd_ed25519:
     source:
       type: pie
       repo: mariadb/mysqlnd_ed25519
+      extract: mysqlnd_ed25519
     metadata:
       license-files: [LICENSE]
       license: BSD-3-Clause

config/pkg/ext/ext-mysqlnd_parsec.yml

@@ -4,6 +4,7 @@ ext-mysqlnd_parsec:
     source:
       type: pie
       repo: mariadb/mysqlnd_parsec
+      extract: mysqlnd_parsec
     metadata:
       license-files: [LICENSE]
       license: BSD-3-Clause

config/pkg/ext/ext-pcov.yml

@@ -4,6 +4,7 @@ ext-pcov:
     source:
       type: pie
       repo: pecl/pcov
+      extract: pcov
     metadata:
       license-files: [LICENSE]
       license: PHP-3.01

config/pkg/ext/ext-xdebug.yml

@@ -4,6 +4,7 @@ ext-xdebug:
     source:
       type: pie
       repo: xdebug/xdebug
+      extract: xdebug
     metadata:
       license-files: [LICENSE]
       license: Xdebug-1.03