Ensure py* installer scripts can find configuration files

toolset/setup/linux/languages/pypy.sh

@@ -10,4 +10,4 @@ ln -sf pypy-2.3.1-linux64 pypy
 fw_get https://bootstrap.pypa.io/get-pip.py
 pypy/bin/pypy get-pip.py
 
-pypy/bin/pip install -r ../config/requirements-pypy.txt
+pypy/bin/pip install -r $FWROOT/config/requirements-pypy.txt

toolset/setup/linux/languages/python2.sh

@@ -14,4 +14,4 @@ make install
 cd ..
 fw_get https://bootstrap.pypa.io/get-pip.py -O get-pip2.py
 py2/bin/python get-pip2.py
-py2/bin/pip install -r ../config/requirements.txt
+py2/bin/pip install -r $FWROOT/config/requirements.txt

toolset/setup/linux/languages/python3.sh

@@ -12,4 +12,4 @@ make -j4
 make install
 
 cd ..
-py3/bin/pip3 install -r ../config/requirements-py3.txt
+py3/bin/pip3 install -r $FWROOT/config/requirements-py3.txt