Use DOTNET_HOST_PATH to run cdac-build-tool, when available

Related to
dotnet/installer#19534 (comment)

Co-Authored-By: Adeel Mujahid <3840695+am11@users.noreply.github.com>

Author: lambdageek

src/coreclr/debug/runtimeinfo/CMakeLists.txt

@@ -75,7 +75,7 @@ else()
   add_custom_command(
     OUTPUT "${CONTRACT_DESCRIPTOR_OUTPUT}"
     VERBATIM
-    COMMAND dotnet ${CDAC_BUILD_TOOL_BINARY_PATH} compose -o "${CONTRACT_DESCRIPTOR_OUTPUT}" -c "${CONTRACT_FILE}" $<TARGET_OBJECTS:cdac_data_descriptor>
+    COMMAND ${CLR_DOTNET_HOST_PATH} ${CDAC_BUILD_TOOL_BINARY_PATH} compose -o "${CONTRACT_DESCRIPTOR_OUTPUT}" -c "${CONTRACT_FILE}" $<TARGET_OBJECTS:cdac_data_descriptor>
     DEPENDS cdac_data_descriptor cee_wks_core $<TARGET_OBJECTS:cdac_data_descriptor> "${CONTRACT_FILE}"
     USES_TERMINAL
   )

src/coreclr/runtime.proj

@@ -50,6 +50,8 @@
       <_CoreClrBuildArg Condition="'$(HostCrossOS)' != ''" Include="-hostos $(HostCrossOS)" />
       <_CoreClrBuildArg Include="-outputrid $(OutputRID)" />
       <_CoreClrBuildArg Condition="'$(BuildSubdirectory)' != ''" Include="-subdir $(BuildSubdirectory)" />
+      <_CoreClrBuildArg Include="-cmakeargs &quot;-DCLR_DOTNET_HOST_PATH=$(DOTNET_HOST_PATH)&quot;" Condition="'$(DOTNET_HOST_PATH)' != ''" />
+      <_CoreClrBuildArg Include="-cmakeargs -DCLR_DOTNET_HOST_PATH=dotnet" Condition="'$(DOTNET_HOST_PATH)' == ''" />
       <_CoreClrBuildArg Include="-cmakeargs &quot;-DCDAC_BUILD_TOOL_BINARY_PATH=$(RuntimeBinDir)cdac-build-tool\cdac-build-tool.dll&quot;" />
     </ItemGroup>