python3: fix build on softfloat mips

This patch originally only meant to correct the python3 build for mips
with softfloat, as the original test only checked for mips hardfloat.

Replaced custom C Program for triplet detection with autotools triplet
detection.

(From OE-Core rev: 203336486c84528e8779db93f64cc28e4b372aab)

Signed-off-by: Matthias Schoepfer <matthias.schoepfer@ithinx.io>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/python/python3_3.7.3.bb

@@ -23,6 +23,7 @@ SRC_URI = "http://www.python.org/ftp/python/${PV}/Python-${PV}.tar.xz \
            file://0003-setup.py-pass-missing-libraries-to-Extension-for-mul.patch \
            file://0001-Lib-sysconfig.py-fix-another-place-where-lib-is-hard.patch \
            file://0001-Makefile-fix-Issue36464-parallel-build-race-problem.patch \
+	   file://0001-bpo-36852-proper-detection-of-mips-architecture-for-.patch \
            "
 
 SRC_URI_append_class-native = " \