Add locks in android-build.sh scripts

vendor/boost/Boost-for-Android

@@ -1 +1 @@
-Subproject commit c6012c576e30ff6000ddab0988d59bad849200ce
+Subproject commit 83ba7174dea6e0595085dc30051eb17747e7260a

vendor/boost/android-build.sh

@@ -1,19 +1,25 @@
 #!/bin/sh
 
+set -e
+
 if [ $(find build/$2/lib -name libboost_*.a 2>/dev/null |wc -l) -eq 10 ]; then
 	echo "boost already built for $2";
 	exit 0
 fi
 
-mkdir -p build && rm -rf build/$2 && cd Boost-for-Android || exit 1
+exec 9>/var/tmp/libcryfs-boost.lock
+flock 9
+
+mkdir -p build && rm -rf build/$2 && cd Boost-for-Android
 
 BOOST_TAR=boost_1_77_0.tar.bz2
 if [ ! -f $BOOST_TAR ]; then
-	wget -O $BOOST_TAR https://boostorg.jfrog.io/artifactory/main/release/1.77.0/source/boost_1_77_0.tar.bz2 || exit 1
+	wget -O $BOOST_TAR https://boostorg.jfrog.io/artifactory/main/release/1.77.0/source/boost_1_77_0.tar.bz2
 fi
+sha256sum -c ../checksum.txt
 
-sha256sum -c ../checksum.txt && \
 ./build-android.sh --boost=1.77.0 --arch=$2 --target-version=21 \
 	--with-libraries=atomic,chrono,container,date_time,exception,filesystem,serialization,system,thread \
-	$1 && \
+	$1
+
 mv build/out/$2 ../build

vendor/cryptopp/android-build.sh

@@ -1,14 +1,19 @@
 #!/usr/bin/env bash
 
+set -e
+
 if [ -f "vendor_cryptopp/build/$2/libcryptopp.a" ]; then
 	echo "Crypto++ already built for $2";
 	exit 0;
 fi
 
-export ANDROID_NDK_ROOT=$1 && \
-cd vendor_cryptopp && \
-make clean && \
-mkdir -p build/$2 && \
-source TestScripts/setenv-android.sh 21 $2 && \
-make -f GNUmakefile-cross static && \
+exec 9>/var/tmp/libcryfs-cryptopp.lock
+flock 9
+
+export ANDROID_NDK_ROOT=$1
+cd vendor_cryptopp
+make clean
+mkdir -p build/$2
+source TestScripts/setenv-android.sh 21 $2
+make -f GNUmakefile-cross static
 mv libcryptopp.a build/$2