Drop CMAKE_HOST_SYSTEM_NAME check

Fixes #28

Author: LegalizeAdulthood

config/cmake/configure_trn.cmake

@@ -175,9 +175,6 @@ function(configure_trn)
     set(STRING_CASE_COMPARE_SOURCES_strings "")
     set(STRING_CASE_COMPARE_SOURCES_manual "string_case_compare.cpp")
     set(STRING_CASE_COMPARE_SOURCES ${STRING_CASE_COMPARE_SOURCES_${STRING_CASE_COMPARE_FLAVOR}} PARENT_SCOPE)
-    if((NOT CMAKE_HOST_SYSTEM_NAME STREQUAL "Linux") AND (NOT CMAKE_HOST_SYSTEM_NAME STREQUAL "Windows"))
-        message(FATAL_ERROR "Unknown system ${CMAKE_HOST_SYSTEM_NAME}; expected 'Linux' or 'Windows'")
-    endif()
     configure_flavor_header("fdio" "${FDIO_FLAVOR}")
     configure_flavor_header("pipe_io" "${PIPE_IO_FLAVOR}")
     configure_flavor_header("string_case_compare" "${STRING_CASE_COMPARE_FLAVOR}")