Restrict LLVM_TARGETS_TO_BUILD in Windows release packaging (#106059)

When including all targets, some files become too large for the NSIS
installer to handle.

Fixes #101994

Author: zmodem

llvm/utils/release/build_llvm_release.bat

@@ -151,6 +151,7 @@ set common_cmake_flags=^
   -DCMAKE_BUILD_TYPE=Release ^
   -DLLVM_ENABLE_ASSERTIONS=OFF ^
   -DLLVM_INSTALL_TOOLCHAIN_ONLY=ON ^
+  -DLLVM_TARGETS_TO_BUILD="AArch64;ARM;X86" ^
   -DLLVM_BUILD_LLVM_C_DYLIB=ON ^
   -DCMAKE_INSTALL_UCRT_LIBRARIES=ON ^
   -DPython3_FIND_REGISTRY=NEVER ^