builld: allow out of source build * Makefile.in: add TOP_BUILD_DIR var and use TOP_DIR=srcdir, TOP_BUILD_DIR=builddir, modify paths to use TOP_DIR where needed * binary-dist-rules.mk: use TOP_DIR and TOP_BUILD_DIR where needed * makeinst-script.sh: use script path to determine TOPDIR, use TOPDIR where needed * src/default-octave.mk: install octave-version to builddir * src/stable-octave.mk: install octave-version to builddir * src/octave.mk: install octave-version to builddir * tools/set-mxe-env.sh.in: update fir builddir and srcdir use

# This file is part of MXE.
# See index.html for further information.

--- ./frontend/main.c.backup	2010-07-01 16:53:48.563042615 +0200
+++ ./frontend/main.c	2010-07-01 16:54:03.379043126 +0200
@@ -31,7 +31,6 @@
 #ifdef _WIN32
 #define WIN32_LEAN_AND_MEAN
 #include <windows.h>
-#define off_t __int64
 #else
 #include <time.h>
 #endif