[c-host] fixed project for cross compliation for Win on Linux

Thanks @fatalis for your guidance on this

c-host/README.md

@@ -36,6 +36,8 @@ Don't ask if you can't figure it out, this code is the very definition of experi
 
 Hint:
 
+### For Windows on Windows
+
 ```
 mkdir build
 cd build
@@ -43,6 +45,24 @@ cmake -G "MSYS Makefiles" ..
 make
 ```
 
+### For Linux on Linux
+
+```
+mkdir build
+cd build
+cmake ..
+make
+```
+
+### For Windows cross compiling on Linux
+
+```
+mkdir build
+cd build
+cmake -DCMAKE_TOOLCHAIN_FILE=../toolchain-mingw64.cmake ..
+make
+```
+
 ## Where is the log?
 
 It is in your user's temp directory: