Adds support for Linux ARM GLESv2

[imsys]

This basically adds supports to many devices of Linux handhelds firmwares, like Rocknix, Knulli and others.

# ========================================================
# Dockerfile to build TIC-80 for TrimUI (AArch64)
# ========================================================

FROM ubuntu:22.04

# Install build dependencies
RUN apt-get update && apt-get install -y \
    cmake git make xz-utils wget curl python3 ruby rake pkg-config \
    && rm -rf /var/lib/apt/lists/*

# Install Arm GNU Toolchain (GCC 10.3.1, AArch64)
WORKDIR /opt
RUN wget https://developer.arm.com/-/media/Files/downloads/gnu-a/10.3-2021.07/binrel/gcc-arm-10.3-2021.07-x86_64-aarch64-none-linux-gnu.tar.xz \
    && tar -xf gcc-arm-10.3-2021.07-x86_64-aarch64-none-linux-gnu.tar.xz \
    && rm gcc-arm-10.3-2021.07-x86_64-aarch64-none-linux-gnu.tar.xz

# Define Toolchain Paths
ENV CROSS_ROOT=/opt/gcc-arm-10.3-2021.07-x86_64-aarch64-none-linux-gnu
ENV PATH="${CROSS_ROOT}/bin:${PATH}"
ENV CROSS_COMPILE=aarch64-none-linux-gnu-

# Install symbol extraction dependencies
RUN apt-get update && apt-get install -y binutils libsdl2-dev libgles2-mesa-dev libegl1-mesa-dev

# Create stub libraries for linking (satisfied by device firmware at runtime)
# We extract the symbol names from the builder's libraries and generate empty C stubs.
# This prevents glibc versioning issues while satisfying the linker.
RUN for lib in /usr/lib/x86_64-linux-gnu/libSDL2-2.0.so.0 /usr/lib/x86_64-linux-gnu/libGLESv2.so.2 /usr/lib/x86_64-linux-gnu/libEGL.so.1; do \
        outname=$(basename $lib | sed 's/-2.0//; s/\.so\..*/.so/') && \
        echo "Generating stubs for $outname from $lib" && \
        nm -D $lib | grep " T " | awk '{print "void " $3 "(){}"}' > stubs.c && \
        ${CROSS_COMPILE}gcc -shared -o ${CROSS_ROOT}/aarch64-none-linux-gnu/libc/usr/lib/$outname stubs.c; \
    done

# --- Fetch TIC-80 ---
WORKDIR /wrk
#RUN git clone https://github.com/nesbox/tic-80.git && \
#    cd tic-80 && git submodule update --init --recursive
COPY . tic-80

# --- Build TIC-80 ---
WORKDIR /wrk/tic-80/build/trimui

RUN cmake ../.. \
      -DCMAKE_SYSTEM_NAME=Linux \
      -DCMAKE_SYSTEM_PROCESSOR=aarch64 \
      -DCMAKE_C_COMPILER=${CROSS_COMPILE}gcc \
      -DCMAKE_CXX_COMPILER=${CROSS_COMPILE}g++ \
      -DCMAKE_SYSROOT=${CROSS_ROOT}/aarch64-none-linux-gnu/libc \
      -DCMAKE_FIND_ROOT_PATH=${CROSS_ROOT}/aarch64-none-linux-gnu/libc \
      -DCMAKE_FIND_ROOT_PATH_MODE_PROGRAM=NEVER \
      -DCMAKE_FIND_ROOT_PATH_MODE_LIBRARY=ONLY \
      -DCMAKE_FIND_ROOT_PATH_MODE_INCLUDE=ONLY \
      -DCMAKE_FIND_ROOT_PATH_MODE_PACKAGE=ONLY \
      -DCMAKE_BUILD_TYPE=Release \
      -DBUILD_PRO=OFF \
      -DBUILD_WITH_ALL=ON \
      -DCMAKE_C_FLAGS_RELEASE="-mcpu=cortex-a53 -Ofast -flto" \
      -DCMAKE_CXX_FLAGS_RELEASE="-mcpu=cortex-a53 -Ofast -flto " \
      -DBUILD_SDL=ON \
      -DBUILD_SDLGPU=ON \
      -DBUILD_EDITORS=OFF \
      -DBUILD_SURF=ON \
      -DPREFER_SYSTEM_SDL2=ON \
      -DBUILD_STATIC=ON \
      -DTIC_DATA_PATH="/userdata/roms/tic80/"

RUN cmake --build . --target tic80 --config Release --parallel

RUN mkdir /output

# then get the file out with:

# docker run --rm -v "$PWD":/output tic-trimui:latest cp /wrk/tic-80/build/trimui/bin/tic80 /output 

RUN ["/bin/bash"]

[imsys]

I plan to add the linux-arm64-gles2 to the Github CI/CD, but I will wait for the PR #2910 to be closed, as to avoid the git conflict.

There is also some other things I need to test and review.