Fix mobile rendering issues and optimize buffer handling for ARM64 - #46
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…correctly to the arm64 target
…penGL backend Mali GLES drivers throw "buffer is already mapped" on glDrawArrays/ glDrawElements when vertex/light/bone buffers use real glMapBufferRange/ glUnmapBuffer, causing all scene geometry to vanish under vid_preferbackend 0. Mirror the CPU shadow-buffer + glBufferSubData approach already used by the OpenGL ES backend (gles_buffers.cpp) instead of mapping the buffer for real.
…only affects specific build target
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