Add back VERSION file to release tarballs

Make sure it makes its way into the sysroot tarball and then copy it
from the sysroot location to the top of the sdk tarball as well.

Closes #471

ci/merge-artifacts.sh

@@ -60,6 +60,7 @@ for build in dist-*; do
   tar xf $toolchain -C dist/$sdk_dir --strip-components 1
   mkdir -p dist/$sdk_dir/share/wasi-sysroot
   tar xf $sysroot -C dist/$sdk_dir/share/wasi-sysroot --strip-components 1
+  mv dist/$sdk_dir/share/wasi-sysroot/VERSION dist/$sdk_dir
 
   # Setup the compiler-rt library for wasi,wasip1,wasip2
   rtlibdir=$(dirname $(find dist/$sdk_dir/lib -name include))/lib

cmake/wasi-sdk-sysroot.cmake

@@ -334,7 +334,7 @@ file(GENERATE OUTPUT ${version_file_tmp} CONTENT ${version_dump})
 add_custom_target(version-file DEPENDS ${version_file_tmp})
 add_dependencies(build version-file)
 install(FILES ${version_file_tmp}
-        DESTINATION ${CMAKE_INSTALL_PREFIX})
+        DESTINATION ${wasi_sysroot})
 
 if(WASI_SDK_INCLUDE_TESTS)
   add_subdirectory(tests)
@@ -353,7 +353,7 @@ add_dependencies(dist-compiler-rt compiler-rt)
 # Tarball with the whole sysroot
 wasi_sdk_add_tarball(dist-sysroot
   ${dist_dir}/wasi-sysroot-${wasi_sdk_version}.tar.gz
-  ${wasi_tmp_install}/share/wasi-sysroot)
+  ${wasi_sysroot})
 add_dependencies(dist-sysroot build)
 
 add_custom_target(dist DEPENDS dist-compiler-rt dist-sysroot)