Fix the help printouts in scripts

Printing '<triple>' causes the shell to try to read a file named
triple. One could either quote it, or just remove the angle brackets;
removing the brackets for simplicity.

build-mingw-w64-tools.sh

@@ -34,7 +34,7 @@ while [ $# -gt 0 ]; do
 done
 if [ -z "$CHECKOUT_ONLY" ]; then
     if [ -z "$PREFIX" ]; then
-        echo $0 [--skip-include-triplet-prefix] [--host=<triple>] dest
+        echo $0 [--skip-include-triplet-prefix] [--host=triple] dest
         exit 1
     fi