Removed hard fix for conda.

I am removing a fix that I needed to introduce last
year to make working conda builds of the python
wrappers. Apparently, this is not needed anymore due to
some updates in conda.

See #952

conda/py-plumed/build.sh

@@ -3,7 +3,7 @@
 cd python
 make pip
 export plumed_default_kernel=$PREFIX/lib/libplumedKernel$SHLIB_EXT
-export plumed_disable_rtld_deepbind=yes
+#export plumed_disable_rtld_deepbind=yes
 
 $PYTHON -m pip install . --no-deps -vv