Depends on EGL 1.5 symbols

[Chris Halse Rogers]

When run against EGL drivers that support 1.4 but not 1.5, Qt will fail to load the Wayland client integration plugin.

For example:
```
qterminal: symbol lookup error: /usr/lib/aarch64-linux-gnu/qt5/plugins/wayland-graphics-integration-client/libqt-plugin-wayland-egl.so: undefined symbol: eglGetPlatformDisplay
```

This is because qtwayland5 unconditionally uses a couple of symbols introduced in EGL 1.5 - `eglGetPlatformDisplay` and `eglCreatePlatformWindowSurface`.

ProblemType: Bug
DistroRelease: Ubuntu 23.04
Package: qtwayland5 5.15.8-2
ProcVersionSignature: Ubuntu 6.1.0-14.14-generic 6.1.6
Uname: Linux 6.1.0-14-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.26.0-0ubuntu2
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: KDE
Date: Mon Feb 27 13:43:25 2023
InstallationDate: Installed on 2021-06-26 (610 days ago)
InstallationMedia: Ubuntu 21.10.0 2021.05.28 amd64 "bcachefs" (20210622)
SourcePackage: qtwayland-opensource-src
UpgradeStatus: Upgraded to lunar on 2023-02-09 (18 days ago)