Add riscv triplet detection

Signed-off-by: David Abdurachmanov <david.abdurachmanov@sifive.com>

Python-3.6.10-riscv-triplets.patch

@@ -0,0 +1,19 @@
+diff --git a/configure.ac b/configure.ac
+index c071ec3..53ed6cd 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -846,6 +846,14 @@ cat >> conftest.c <<EOF
+         sparc64-linux-gnu
+ # elif defined(__sparc__)
+         sparc-linux-gnu
++# elif defined(__riscv)
++#  if __riscv_xlen == 32
++        riscv32-linux-gnu
++#  elif __riscv_xlen == 64
++        riscv64-linux-gnu
++#  else
++#   error unknown platform triplet
++#  endif
+ # else
+ #   error unknown platform triplet
+ # endif

python3.6.spec

@@ -365,6 +365,9 @@ Patch294: 00294-define-TLS-cipher-suite-on-build-time.patch
 # https://github.com/python/cpython/commit/ac827edc493d3ac3f5b9b0cc353df1d4b418a9aa
 Patch343: 00343-faulthandler-gcc10.patch
 
+# Add riscv64-linux-gnu to the triplet detection
+Patch500: Python-3.6.10-riscv-triplets.patch
+
 # (New patches go here ^^^)
 #
 # When adding new patches to "python" and "python3" in Fedora, EL, etc.,
@@ -653,6 +656,7 @@ rm Lib/ensurepip/_bundled/*.whl
 %patch294 -p1
 %patch343 -p1
 
+%patch500 -p1
 
 # Remove files that should be generated by the build
 # (This is after patching, so that we can use patches directly from upstream)