Stuart Ianna c1db9732c5 libs/libc/spawn: Add minimal implementation for posix_spawnattr_destory.
Add a minimal implementation to suppress warnings when building
application code shared with other operating systems.

For example:

When building with a c++ compiler and GCC 12.2.0, the following warning is emitted:

nuttx/include/spawn.h:178:40: warning: statement has no effect [-Wunused-value]
  178 | #define posix_spawnattr_destroy(attr) (0)
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