Revert "Require gtk 3 on Linux"

This reverts commit 2e6a761f.

resources/linux/debian/control.template

 Package: @@NAME@@
 Version: @@VERSION@@
 Section: devel
-Depends: libnotify4, libnss3, gnupg, apt, libxkbfile1, libgconf-2-4, libsecret-1-0, libgtk-3-0 (>= 3.10.0)
+Depends: libnotify4, libnss3, gnupg, apt, libxkbfile1, libgconf-2-4, libsecret-1-0
 Priority: optional
 Architecture: @@ARCHITECTURE@@
 Maintainer: Microsoft Corporation <vscode-linux@microsoft.com>

resources/linux/rpm/dependencies.json

@@ -4,7 +4,7 @@
 		"libpthread.so.0(GLIBC_2.2.5)(64bit)",
 		"libpthread.so.0(GLIBC_2.3.2)(64bit)",
 		"libpthread.so.0(GLIBC_2.3.3)(64bit)",
-		"libgtk-3.so.0()(64bit)",
+		"libgtk-x11-2.0.so.0()(64bit)",
 		"libgdk-x11-2.0.so.0()(64bit)",
 		"libatk-1.0.so.0()(64bit)",
 		"libgio-2.0.so.0()(64bit)",
@@ -114,7 +114,7 @@
 		"libglib-2.0.so.0",
 		"libgmodule-2.0.so.0",
 		"libgobject-2.0.so.0",
-		"libgtk-3.so.0",
+		"libgtk-x11-2.0.so.0",
 		"libm.so.6",
 		"libm.so.6(GLIBC_2.0)",
 		"libm.so.6(GLIBC_2.1)",