close h5py#1244

Issue: ">f8" was written as ">f16" on ppc64le
Actually the dict doing the mapping between numpy and hdf5 was wrong.
Stop iterating when first matching is found, avoiding "f16" to replace "f8"

h5py/h5t.pyx

@@ -1369,11 +1369,9 @@ cdef class TypeEnumID(TypeCompositeID):
 def _get_float_dtype_to_hdf5():
     float_le = {}
     float_be = {}
-    h5_be_list = [IEEE_F16BE, IEEE_F32BE, IEEE_F64BE, IEEE_F128BE,
-                  LDOUBLE_BE]
-    h5_le_list = [IEEE_F16LE, IEEE_F32LE, IEEE_F64LE, IEEE_F128LE]
-    if MACHINE != 'ppc64le':
-        h5_le_list.append(LDOUBLE_LE)
+    h5_be_list = [IEEE_F16BE, IEEE_F32BE, IEEE_F64BE, IEEE_F128BE, LDOUBLE_BE]
+    h5_le_list = [IEEE_F16LE, IEEE_F32LE, IEEE_F64LE, IEEE_F128LE, LDOUBLE_LE]
+
     for ftype_, finfo, size in _available_ftypes:
         nmant, maxexp, minexp = _correct_float_info(ftype_, finfo)
         for h5type in h5_be_list:
@@ -1383,13 +1381,15 @@ def _get_float_dtype_to_hdf5():
                 (maxexp - 1) == ebias
             ):
                 float_be[ftype_] = h5type
+                break # first found matches, related to #1244
         for h5type in h5_le_list:
             spos, epos, esize, mpos, msize = h5type.get_fields()
             ebias = h5type.get_ebias()
             if (finfo.iexp == esize and nmant == msize and
                 (maxexp - 1) == ebias
             ):
                 float_le[ftype_] = h5type
+                break # first found matches, related to #1244
     if ORDER_NATIVE == H5T_ORDER_LE:
         float_nt = dict(float_le)
     else: