fix(main/libmcrypt): fix building with ./build-all.sh

Fix for `error: call to undeclared library function 'memmove/calloc/malloc/memcpy/free/sprintf/etc.'` during running `build-all.sh`
Probably it would be easier to add `-Wimplicit-function-declaration` to `CFLAGS`, but this solution feels more correct.

Related to #21130.

I will merge this in 36 hours if nobody minds or after it gets 2+ approves.

packages/libmcrypt/build.sh

@@ -2,11 +2,20 @@ TERMUX_PKG_HOMEPAGE=https://mcrypt.sourceforge.net/
 TERMUX_PKG_DESCRIPTION="A library which provides a uniform interface to several symmetric encryption algorithms"
 TERMUX_PKG_LICENSE="GPL-2.0"
 TERMUX_PKG_MAINTAINER="@termux"
-TERMUX_PKG_VERSION=2.5.8
-TERMUX_PKG_REVISION=3
+TERMUX_PKG_VERSION="2.5.8"
+TERMUX_PKG_REVISION=4
 TERMUX_PKG_SRCURL=https://downloads.sourceforge.net/mcrypt/libmcrypt-$TERMUX_PKG_VERSION.tar.bz2
 TERMUX_PKG_SHA256=bf2f1671f44af88e66477db0982d5ecb5116a5c767b0a0d68acb34499d41b793
 TERMUX_PKG_BREAKS="libmcrypt-dev"
 TERMUX_PKG_REPLACES="libmcrypt-dev"
 TERMUX_PKG_BUILD_IN_SRC=true
 TERMUX_PKG_EXTRA_CONFIGURE_ARGS="--mandir=$TERMUX_PREFIX/share/man"
+
+termux_step_post_configure() {
+	# Fix for `error: call to undeclared library function 'memmove/calloc/malloc/memcpy/free/sprintf/etc.'` during running `build-all.sh`
+	# Probably it would be easier to add `-Wimplicit-function-declaration` to `CFLAGS`, but this solution feels more correct.
+	echo "#include <stdio.h>" >> "$TERMUX_PKG_SRCDIR/config.h"
+	echo "#include <stdlib.h>" >> "$TERMUX_PKG_SRCDIR/config.h"
+	echo "#include <string.h>" >> "$TERMUX_PKG_SRCDIR/config.h"
+	echo "#include <ctype.h>" >> "$TERMUX_PKG_SRCDIR/config.h"
+}