Bump emacs revision to rebuild on arm

The emacs arm build were broken due to the toolchain being broken
(#317) - bump the build revision to rebuild the package with a
fixed toolchain.

Fixes #322

packages/emacs/build.sh

@@ -1,6 +1,7 @@
 TERMUX_PKG_HOMEPAGE=http://www.gnu.org/software/emacs/
 TERMUX_PKG_DESCRIPTION="Extensible, customizable text editor-and more"
 TERMUX_PKG_VERSION=25.0.95
+TERMUX_PKG_BUILD_REVISION=1
 TERMUX_PKG_SRCURL=ftp://alpha.gnu.org/gnu/emacs/pretest/emacs-${TERMUX_PKG_VERSION}.tar.xz
 TERMUX_PKG_DEPENDS="ncurses, gnutls, libxml2"
 TERMUX_PKG_EXTRA_CONFIGURE_ARGS="--without-x --with-xpm=no --with-jpeg=no --with-png=no --with-gif=no --with-tiff=no --without-gconf --without-gsettings --with-gnutls --with-xml2"