Cache depeneencies for aerc on device builds

packages/aerc/build.sh

@@ -10,4 +10,14 @@ TERMUX_PKG_BUILD_IN_SRC=true
 
 termux_step_pre_configure() {
 	termux_setup_golang
+	if $TERMUX_ON_DEVICE_BUILD; then
+		export GOPATH=$TERMUX_PKG_SRCDIR/go
+		if [ -d $TERMUX_PKG_CACHEDIR/go ]; then
+			cp $TERMUX_PKG_CACHEDIR/go $GOPATH -r
+		else
+			go get
+			cp $TERMUX_PKG_SRCDIR/go $TERMUX_PKG_CACHEDIR/go -r
+		fi
+		
+	fi
 }