Fix 429163: fix Windows platform detection

Author: Brenton Bostick

cmake/WolframKernel.cmake

@@ -1,6 +1,6 @@
 
 if(NOT DEFINED MATHEMATICA_INSTALL_DIR)
-if(CMAKE_HOST_WIN32 OR CYGWIN)
+if(CMAKE_HOST_WIN32)
 	set(MATHEMATICA_INSTALL_DIR "C:/Program Files/Wolfram Research/Mathematica/13.1")
 elseif(CMAKE_HOST_APPLE)
 	set(MATHEMATICA_INSTALL_DIR /Applications/Mathematica.app/Contents)
@@ -9,7 +9,7 @@ else()
 endif()
 endif()
 
-if(MSVC)
+if(CMAKE_HOST_WIN32)
 	set(WOLFRAMKERNEL_DEFAULT ${MATHEMATICA_INSTALL_DIR}/wolfram.exe)
 	set(WOLFRAMLIBRARY_INCLUDE_DIR_DEFAULT ${MATHEMATICA_INSTALL_DIR}/SystemFiles/IncludeFiles/C)
 	#
@@ -30,7 +30,7 @@ if(MSVC)
 	else()
 	set(MATHLINK_LIB_DIR_DEFAULT ${MATHEMATICA_INSTALL_DIR}/SystemFiles/Links/MathLink/DeveloperKit/Windows-x86-64/CompilerAdditions)
 	endif()
-elseif (APPLE)
+elseif(CMAKE_HOST_APPLE)
 	set(WOLFRAMKERNEL_DEFAULT ${MATHEMATICA_INSTALL_DIR}/MacOS/WolframKernel)
 	set(WOLFRAMLIBRARY_INCLUDE_DIR_DEFAULT ${MATHEMATICA_INSTALL_DIR}/SystemFiles/IncludeFiles/C)
 	set(MATHLINK_INCLUDE_DIR_DEFAULT ${MATHEMATICA_INSTALL_DIR}/SystemFiles/Links/MathLink/DeveloperKit/MacOSX-x86-64/CompilerAdditions)