file: Tell configure that mmap works

This avoids segfault mentioned in http://bugs.gw.com/view.php?id=494
and should fix #53.

packages/file/build.sh

@@ -1,7 +1,8 @@
 TERMUX_PKG_HOMEPAGE=http://darwinsys.com/file/
 TERMUX_PKG_DESCRIPTION="Command-line tool that tells you in words what kind of data a file contains"
 TERMUX_PKG_VERSION=5.25
-# TERMUX_PKG_SRCURL=ftp://ftp.astron.com/pub/file/file-${TERMUX_PKG_VERSION}.tar.gz
+TERMUX_PKG_BUILD_REVISION=1
 TERMUX_PKG_SRCURL=http://fossies.org/linux/misc/file-${TERMUX_PKG_VERSION}.tar.gz
+TERMUX_PKG_EXTRA_CONFIGURE_ARGS="ac_cv_func_mmap_fixed_mapped=yes"
 TERMUX_PKG_EXTRA_MAKE_ARGS="FILE_COMPILE=$TERMUX_PKG_HOSTBUILD_DIR/src/file"
 TERMUX_PKG_HOSTBUILD="yes"