Detection of gcc win32 and macos hosts.

Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@755

configure.in

@@ -73,6 +73,20 @@ AC_ARG_ENABLE(shots,[  --enable-shots          Enable screenshot support],[
   fi
 ],)
 
+dnl Some host detection and actions for them
+case "$target" in
+    *-*-cygwin* | *-*-mingw32*)
+       LIBS="$LIBS -lwinmm"
+       ;;
+    darwin*)
+       dnl We have a problem here: both MacOS X and Darwin report 
+       dnl the same signature "powerpc-apple-darwin*" - so we have
+       dnl to do more to distinguish them.
+       dnl For now I am lazy and do not add proper detection code.
+       AC_DEFINE(MACOSX, 1, [Compiling on Mac OS X])
+       LIBS="$LIBS -framework AudioUnit"
+       ;;
+esac
 
 
 AC_OUTPUT([