Split check-build into check-source and check-win32.

test/check-source

@@ -0,0 +1,37 @@
+#!/bin/sh
+
+#
+# Check that we have no tabs or trailing spaces in the source code
+#
+nfails=0
+nfiles=0
+nlines=0
+for dir in $(make -s echo-dirs -C ..); do
+  if [ ! -d "../$dir" ]; then continue; fi
+  for x in $(make -s echo-sources -C ../$dir); do
+    case "$x" in
+      *.c|*.cpp|*.h|*.m|*.php|*.cs|*.java|.py|.pl)
+        nfiles=$(($nfiles + 1));
+        nlines=$(($nlines + `grep -c . "../$dir/$x"`)) ;;
+      *)
+        continue ;;
+    esac
+    if grep '[[:space:]]$' "../$dir/$x" >/dev/null 2>&1; then
+      echo "error: $dir/$x contains trailing spaces"
+      nfails=$(($nfails + 1))
+    fi
+    if grep '	' "../$dir/$x" >/dev/null 2>&1; then
+      echo "error: $dir/$x contains tabs"
+      nfails=$(($nfails + 1))
+    fi
+  done
+done
+
+echo "$nfiles files, $nlines lines, $nfails errors in source code"
+
+if test "$nfails" != "0"; then
+  exit 1
+fi
+
+exit 0
+