vlc-debian-llvm-msvcrt: install libegl-dev

Qt 6 Shader Tools seems to require EGL.

vlc-debian-llvm-msvcrt/Dockerfile

@@ -13,7 +13,7 @@ RUN apt-get update -qq && mkdir -p /usr/share/man/man1 && \
     apt-get -y dist-upgrade && \
     apt-get install -qqy --no-install-suggests --no-install-recommends \
         git wget bzip2 file unzip libtool-bin pkg-config build-essential \
-        automake yasm gettext autopoint vim ninja-build ant libgl-dev \
+        automake yasm gettext autopoint vim ninja-build ant libgl-dev libegl-dev \
         winbind flex ragel bison zip dos2unix p7zip-full gperf nsis nasm cmake \
         python3 python3-venv python3-setuptools python3-mako locales meson help2man libltdl-dev \
         ca-certificates curl default-jdk-headless gnupg procps libcurl4-gnutls-dev && \