MAINT: distutils: remove obsolete search for ecc executable

This is a very old name for the `icc` executable. The problem that
triggered this change is that the `find_executable` calls to determine
if the name is `icc` or `ecc` was done at import time, and after an
unrelated change in Meson (related to `icc` though) started printing
`log.warn` output from within `find_executable` to report that the
icc/ecc executables weren't found. That looked like::

  WARN: Could not locate executable icc
  WARN: Could not locate executable ecc

That in turn seemed to (but didn't actually) affect an import test
(`test_api_importable` in `numpy/tests/test_public_api.py`).

Finally, the `ecc` name may simply be wrong, for example this is a compiler-like
thing and the first hit when you search for `ecc` compiler:
https://github.com/santerijps/ecc

Long story short: this removes some obsolete code which can yield potentially
confusing stdout output.

[skip cirrus] [skip circle]

Author: rgommers

numpy/distutils/intelccompiler.py

@@ -37,12 +37,7 @@ def __init__(self, verbose=0, dry_run=0, force=0):
 
 class IntelItaniumCCompiler(IntelCCompiler):
     compiler_type = 'intele'
-
-    # On Itanium, the Intel Compiler used to be called ecc, let's search for
-    # it (now it's also icc, so ecc is last in the search).
-    for cc_exe in map(find_executable, ['icc', 'ecc']):
-        if cc_exe:
-            break
+    cc_exe = 'icc'
 
 
 class IntelEM64TCCompiler(UnixCCompiler):