Add Wasm, RISC-V, and BPF targets back to Windows release packaging

In #106059 we reduced the targets to those supported by Windows (X86
and ARM) to avoid running into size limitations of the NSIS compiler.

Since then, people complained about the lack of Wasm [1], RISC-V [2],
and BPF [3]. These do seem to fit in the installer (at least for
20.1.0-rc2), so let's add them back.

[1] https://discourse.llvm.org/t/llvm-19-x-release-third-party-binaries/80374/26
[2] https://discourse.llvm.org/t/llvm-19-x-release-third-party-binaries/80374/53
[3] #127120

Author: zmodem

llvm/utils/release/build_llvm_release.bat

@@ -150,7 +150,7 @@ 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_TARGETS_TO_BUILD="AArch64;ARM;X86;BPF;WebAssembly;RISCV" ^
   -DLLVM_BUILD_LLVM_C_DYLIB=ON ^
   -DCMAKE_INSTALL_UCRT_LIBRARIES=ON ^
   -DPython3_FIND_REGISTRY=NEVER ^