Fix compile errors of workloads due to emsdk version upgrade,
enable BUILD_TARGET auto set for some samples,
and call wasm_runtime_init_thread_env() for in thread routine which
was created by pthread_create but not runtime in spawn-thread sample.
Signed-off-by: Wenyong Huang <wenyong.huang@intel.com>
Fix the build issues on mac for basic/multi-module/multi-thread/
simple/spawn-thread/wasm-c-api under samples.
And all these samples could be run as expected.
Signed-off-by: Xiaokang Qin <xiaokang.qxk@antgroup.com>
