No colon cinterop flags (#428)

* Taught cinterop a 'host' target.

* Last minute switch from -foo:bar flags to -foo bar flags in cinterop tool.

samples/libcurl/build.sh

@@ -23,5 +23,5 @@ LINKER_ARGS=${!var}
 var=COMPILER_ARGS_${TARGET}
 COMPILER_ARGS=${!var} # add -opt for an optimized build.
 
-cinterop -copt:"$CFLAGS" -copt:-I. -def:$DIR/libcurl.def -target:$TARGET -o:libcurl.bc || exit 1
+cinterop -copt "$CFLAGS" -copt -I. -def $DIR/libcurl.def -target $TARGET -o libcurl.bc || exit 1
 konanc -target $TARGET src -library libcurl.bc -linkerArgs "$LINKER_ARGS" -o Curl.kexe || exit 1