autogen.sh: Make it work with old Solaris 10 shell.

autogen.sh

@@ -110,7 +110,10 @@ check_tool_version ()
   fi
 }
 
-if test ! -f ./builds/unix/configure.raw; then
+# Solaris 10's shell doesn't like the `!` operator to negate the exit status.
+if test -f ./builds/unix/configure.raw; then
+  :
+else
   echo "You must be in the same directory as \`autogen.sh'."
   echo "Bootstrapping doesn't work if srcdir != builddir."
   exit 1
@@ -182,7 +185,9 @@ copy_submodule_files ()
 DLG_INC_DIR=subprojects/dlg/include/dlg
 DLG_SRC_DIR=subprojects/dlg/src/dlg
 
-if ! test -d "$DLG_INC_DIR"; then
+if test -d "$DLG_INC_DIR"; then
+  :
+else
   echo "Checking out submodule in \`subprojects/dlg':"
   git submodule init
   git submodule update