sim/alsa: Use bundled codec headers.

[casaroli]

Summary

Fix CMake header integration for the sim:alsa audio offload codec implementation.

sim_offload.c uses LAME and libmad from the checked-out nuttx-apps tree, but the arch CMake target did not receive their include directories. It also included LAME as <lame/lame.h>, while the bundled public header is lame/include/lame.h. The build consequently depended on host-installed codec development headers and failed when they were absent.

This change uses <lame.h> and exposes the bundled LAME and libmad include directories only when CONFIG_SIM_SOUND_ALSA=y.

Companion Apps PR: apache/nuttx-apps#3666

The companion PR adds the LAME vector translation units that are required at link time when LAME enables x86 SSE2/AVX2 runtime dispatch. Both PRs are required for a complete CMake sim:alsa fix.

Impact

• New feature: No.
• User adaptation: No.
• Build impact: Yes. Makes the CMake sim:alsa target use bundled LAME/libmad headers instead of relying on host codec header installation.
• Hardware impact: No. The change is limited to the simulator ALSA configuration.
• Documentation impact: No.
• Security impact: No.
• Compatibility impact: No. It corrects the include path for the bundled Apps codecs.
• Dependency: audioutils/lame: Add CMake vector sources. nuttx-apps#3666

Testing

Verified locally with the companion Apps branch.

• Build host: Fedora Linux 44, x86_64, GCC 16.1.1.
• Target: sim:alsa, CMake/Ninja, CONFIG_SIM_M32=y.

Before this change, compilation stopped in sim_offload.c:

fatal error: lame/lame.h: No such file or directory

After this change, with the companion Apps change applied:

cmake -B build -DBOARD_CONFIG=sim:alsa -DNXTMPDIR=OFF -GNinja
cmake --build build -j4

completed successfully and produced nuttx.tgz.

Additional verification:

./tools/checkpatch.sh -f arch/sim/src/sim/sim_offload.c
./tools/checkpatch.sh -f arch/sim/src/sim/CMakeLists.txt
git diff --check

All checks completed successfully.

No hardware runtime test applies to this host simulator build.

PR verification self-check

• This PR introduces one focused functional change.
• All required PR description fields are completed.
• The commit has a descriptive topic/body, Signed-off-by, and Assisted-by trailer.
• The modified files pass checkpatch.sh and git diff --check.
• This PR is ready for review.

[github-actions]

MemBrowse Memory Report

No memory changes detected for:

• arduino-mega2560
• esp32-devkitc
• hifive1-revb
• mirtoo
• qemu-armv8a
• qemu-intel64
• rx65n-rsk2mb
• s698pm-dkit
• stm32-nucleo-f103rb