Attempt to lock PR tests to the specific version of libgpuarray that they require.

.jenkins/gpuarray-branch

+v0.6.9
\ No newline at end of file

.jenkins/jenkins_pr_gpu.sh

@@ -23,7 +23,7 @@ LIBDIR=${WORKSPACE}/local
 
 # Make fresh clones of libgpuarray (with no history since we don't need it)
 rm -rf libgpuarray
-git clone --depth 1 "https://github.com/Theano/libgpuarray.git"
+git clone -b `cat .jenkins/gpuarray-branch` --depth 1 "https://github.com/Theano/libgpuarray.git"
 
 # Clean up previous installs (to make sure no old files are left)
 rm -rf $LIBDIR

.jenkins/jenkins_pr_mac.sh

@@ -28,7 +28,7 @@ LIBDIR=${WORKSPACE}/local
 
 # Make fresh clones of libgpuarray (with no history since we don't need it)
 rm -rf libgpuarray
-git clone --depth 1 "https://github.com/Theano/libgpuarray.git"
+git clone -b `cat .jenkins/gpuarray-branch` --depth 1 "https://github.com/Theano/libgpuarray.git"
 
 # Clean up previous installs (to make sure no old files are left)
 rm -rf $LIBDIR

.jenkins/jenkins_pr_win.bat

@@ -19,7 +19,8 @@ set PATH=%PATH%;%LIBDIR%\bin
 
 REM Make fresh clones of libgpuarray (with no history since we dont need it)
 rmdir libgpuarray /s/q
-git clone --depth 1 "https://github.com/Theano/libgpuarray.git"
+set /p GPUARRAY_BRANCH=<.jenkins/gpuarray-branch
+git clone -b %GPUARRAY_BRANCH% --depth 1 "https://github.com/Theano/libgpuarray.git"
 
 REM Clean up previous installs (to make sure no old files are left)
 rmdir %LIBDIR% /s/q