Disable BUILD_SHARED_EXTRAS_LIB in build_tarballs.jl

Remove the option to build shared extras library.

Author: odow

.github/julia/build_tarballs.jl

@@ -26,7 +26,6 @@ cmake -S . -B build \
     -DCMAKE_BUILD_TYPE=Release \
     -DBUILD_SHARED_LIBS=ON \
     -DHIPO=ON \
-    -DBUILD_SHARED_EXTRAS_LIB=OFF \
     -DBLAS_LIBRARIES="${libdir}/libopenblas.${dlext}"
 
 if [[ "${target}" == *-linux-* ]]; then