Fix PNaCl build of zlib on buildbot.

libraries/zlib/build.sh

Index: libraries/zlib/build.sh
diff --git a/libraries/zlib/build.sh b/libraries/zlib/build.sh
index fe99ed0ddf688cf081f9082ee3265686cbbd95c0..fd0e83871e46c1268fc64543b4d839aadd153e9f 100755
--- a/libraries/zlib/build.sh
+++ b/libraries/zlib/build.sh
@@ -10,6 +10,7 @@ source ../../build_tools/common.sh
 ConfigureStep() {
   Banner "Configuring ${PACKAGE_NAME}"
   ChangeDir ${NACL_PACKAGES_REPOSITORY}/${PACKAGE_NAME}
+  LogExecute rm -f libz.*
   # TODO: side-by-side install
   local CONFIGURE_ARGS="--prefix=${NACLPORTS_PREFIX}"
   local CFLAGS="-Dunlink=puts"
@@ -31,6 +32,7 @@ RunMinigzip() {
     echo '  *** minigzip test FAILED ***' ; \
       exit 1
   fi
+  unset LD_LIBRARY_PATH
 }
 
 RunExample() {
@@ -42,7 +44,7 @@ RunExample() {
     #echo '  *** zlib test FAILED ***'; \
     #exit 1
   #fi
-  return
+  unset LD_LIBRARY_PATH
 }
 
 TestStep() {
@@ -87,7 +89,7 @@ PackageInstall() {
   PreInstallStep
   DownloadStep
   ExtractStep
-  # zlib doesn't need patching, so no patch step
+  PatchStep

[jvoung (off chromium), 2013/10/30 18:26:52]

Is this part of a separate change, or is PatchStep just a nop anyway?

[Sam Clegg, 2013/10/30 18:28:12]

In a no-op when when there is no patch file.  

   ConfigureStep
   BuildStep
   ValidateStep