wasmswiftsdk.py: consistently apply build_runtime_with_host_compiler

[MaxDesiatov]

Following up on #83134 #82949 #82946 #82944.

With these changes I'm able to quickly build and test only Wasm Swift SDK without rebuilding the whole toolchain when latest development snapshot is installed, using this invocation:

./swift/utils/build-script --skip-build-benchmarks --release --skip-early-swift-driver \
  --skip-build-lldb --skip-build-cmark --skip-build-llvm --skip-build-swift \
  --build-runtime-with-host-compiler --build-wasm-stdlib 

Timing on M4 MacBook Pro:

--- Build Script Analyzer ---
Build Percentage         Build Duration (sec)    Build Phase
================         ====================    ===========
43.6%                    257.75                  Building wasmswiftsdk
20.6%                    121.91                  Building wasmthreadsstdlib
20.6%                    121.78                  Building wasmstdlib
5.4%                     32.03                   Building wasmllvmruntimelibs
3.6%                     21.39                   Running tests for wasmthreadsstdlib
3.5%                     20.91                   Running tests for wasmstdlib
2.7%                     15.74                   Building wasilibc
0.0%                     0.04                    macosx-arm64-extractsymbols
0.0%                     0.04                    macosx-arm64-package
0.0%                     0.03                    merged-hosts-lipo-core
0.0%                     0.03                    merged-hosts-lipo
Total Duration: 591.65 seconds (9m 51s)

[MaxDesiatov]

@swift-ci smoke test

[MaxDesiatov]

@swift-ci smoke test

[MaxDesiatov]

@swift-ci smoke test

[bnbarham]

@swift-ci please clean test Windows platform

[MaxDesiatov]

@swift-ci test windows

[MaxDesiatov]

@swift-ci test windows