Apply ccache fix.

Author: rcurtin

Jenkinsfile

@@ -26,6 +26,7 @@ pipeline
           git clone https://github.com/mlpack/mlpack
           cd mlpack/
           git checkout $MLPACK_VERSION
+          patch -p1 < ../py_ccache_fix.patch
 
           mkdir build/
           cd build/

azure-pipelines-macos-steps.yml

@@ -11,6 +11,7 @@ steps:
       git clone https://github.com/mlpack/mlpack
       cd mlpack
       git checkout $(MLPACK_VERSION)
+      patch -p1 < ../py_ccache_fix.patch
     displayName: Clone mlpack
 
   - bash: |

azure-pipelines-windows-steps.yml

@@ -53,6 +53,7 @@ steps:
       git clone https://github.com/mlpack/mlpack
       cd mlpack
       git checkout $(MLPACK_VERSION)
+      patch -p1 < ../py_ccache_fix.patch
     displayName: Clone mlpack
 
   - powershell: |