Add memory bounds-check when expanding points, rects and lines to triangles #7898

Job	Run time
build-uwp	14m 4s
build-windows (x64)	17m 23s
build (ubuntu-latest, test, clang, clang++, ./b.sh --headless --unittest, clang-normal)	4m 17s
build-windows (ARM64)	13m 55s
build (ubuntu-latest, gcc, g++, ./b.sh --headless --unittest, gcc-normal)	4m 7s
build (ubuntu-latest, android, clang, clang++, cd android && ./ab.sh -j2 APP_ABI=arm64-v8a UNITTE...	15m 3s
build (ubuntu-latest, android, clang, clang++, cd android && ./ab.sh -j2 APP_ABI=armeabi-v7a UNIT...	7m 30s
build (ubuntu-latest, android, clang, clang++, cd android && ./ab.sh -j2 APP_ABI=x86_64 UNITTEST=...	14m 35s
build (ubuntu-latest, android, clang, clang++, cd android && ./ab.sh -j2 APP_ABI=arm64-v8a OPENXR...	10m 21s
build (ubuntu-latest, android, clang, clang++, ./b.sh --libretro_android ppsspp_libretro, android...	5m 40s
build (ubuntu-latest, qt, gcc, g++, ./b.sh --qt, qt)	4m 19s
build (ubuntu-latest, libretro, gcc, g++, make -C libretro -f Makefile -j2, gcc-libretro)	2m 51s
build (ubuntu-latest, libretro, clang, clang++, make -C libretro -f Makefile -j2, clang-libretro)	2m 45s
build (macos-latest, test, clang, clang++, ./b.sh --headless --unittest --fat --no-png --no-sdl2,...	23m 48s
build (macos-latest, ios, clang, clang++, ./b.sh --ios, ios)	5m 33s
test-windows	1m 17s
test (ubuntu-latest)	1m 52s
test (macos-latest)	52s
	2h 30m 12s

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