emacs: fix #952 by wrapping dup2 internally (#956)

packages/emacs/build.sh

@@ -1,6 +1,7 @@
 TERMUX_PKG_HOMEPAGE=https://www.gnu.org/software/emacs/
 TERMUX_PKG_DESCRIPTION="Extensible, customizable text editor-and more"
 TERMUX_PKG_VERSION=25.2
+TERMUX_PKG_REVISION=1
 TERMUX_PKG_SHA256=59b55194c9979987c5e9f1a1a4ab5406714e80ffcfd415cc6b9222413bc073fa
 TERMUX_PKG_SRCURL=https://mirrors.kernel.org/gnu/emacs/emacs-${TERMUX_PKG_VERSION}.tar.xz
 TERMUX_PKG_DEPENDS="ncurses, gnutls, libxml2"
@@ -13,6 +14,8 @@ TERMUX_PKG_EXTRA_CONFIGURE_ARGS+=" emacs_cv_sanitize_address=yes"
 TERMUX_PKG_EXTRA_CONFIGURE_ARGS+=" emacs_cv_prog_cc_nopie=no"
 # Prevent linking against libelf:
 TERMUX_PKG_EXTRA_CONFIGURE_ARGS+=" ac_cv_lib_elf_elf_begin=no"
+# implemented using dup3(), which fails if oldfd == newfd
+TERMUX_PKG_EXTRA_CONFIGURE_ARGS+=" gl_cv_func_dup2_works=no"
 TERMUX_PKG_HOSTBUILD=yes
 TERMUX_PKG_KEEP_INFOPAGES=yes