Build for host

This fixes the issue where clippy failed to build for arm causing that
release to be incomplete.

We remove the host files from the install directory to reduce the final
size is minimal.

packages/rust/build.sh

@@ -16,8 +16,12 @@ termux_step_configure () {
 		| sed "s%\\@triple\\@%$triple%g" \
 		> config.toml
 
+	local env_host=`printf $triple | tr a-z A-Z | sed s/-/_/g`
+
 	export LD_LIBRARY_PATH=$TERMUX_PKG_BUILDDIR/build/x86_64-unknown-linux-gnu/llvm/lib
-	export OPENSSL_DIR=$TERMUX_PREFIX
+	export ${env_host}_OPENSSL_DIR=$TERMUX_PREFIX
+	export X86_64_UNKNOWN_LINUX_GNU_OPENSSL_LIB_DIR=/usr/lib/x86_64-linux-gnu
+	export X86_64_UNKNOWN_LINUX_GNU_OPENSSL_INCLUDE_DIR=/usr/include
 
 	unset CC CXX CPP LD CFLAGS CXXFLAGS CPPFLAGS LDFLAGS
 }
@@ -28,5 +32,9 @@ termux_step_make () {
 }
 
 termux_step_make_install () {
-	$TERMUX_PKG_SRCDIR/x.py install
+	local host_files_to_remove="$TERMUX_PREFIX/lib/rustlib/x86_64-unknown-linux-gnu \
+		$TERMUX_PREFIX/lib/rustlib/manifest-rust-analysis-x86_64-unknown-linux-gnu \
+		$TERMUX_PREFIX/lib/rustlib/manifest-rust-std-x86_64-unknown-linux-gnu"
+
+	$TERMUX_PKG_SRCDIR/x.py install && rm -rf $host_files_to_remove
 }

packages/rust/no-host-build.patch

@@ -1,10 +0,0 @@
---- ../rustc-1.29.2-src/src/bootstrap/config.rs	2018-10-05 15:19:57.000000000 -0700
-+++ ./src/bootstrap/config.rs	2018-10-19 14:18:14.000000000 -0700
-@@ -416,7 +416,6 @@
- 
-         let build = toml.build.clone().unwrap_or(Build::default());
-         // set by bootstrap.py
--        config.hosts.push(config.build.clone());
-         for host in build.host.iter() {
-             let host = INTERNER.intern_str(host);
-             if !config.hosts.contains(&host) {

scripts/setup-ubuntu.sh

@@ -36,6 +36,7 @@ PACKAGES+=" xmlto"
 PACKAGES+=" libexpat1-dev" # Needed by ghostscript
 PACKAGES+=" libjpeg-dev" # Needed by ghostscript
 PACKAGES+=" gawk" # Needed by apr-util
+PACKAGES+=" libssl-dev" # Needed to build Rust
 
 sudo DEBIAN_FRONTEND=noninteractive \
 	apt-get install -yq --no-install-recommends $PACKAGES