python: fix i686 issues with gcc>=6.3.1

See #6321

srcpkgs/python/patches/fix-i686-semaphore_lock.patch

@@ -1,20 +0,0 @@
-Make sure sval is set before comparing it with self->maxvalue.
-Compare only if the return value was zero.
-This fixes "ValueError: semaphore or lock released too many times"
-which occured only for i686.
-
---- Modules/_multiprocessing/semaphore.c	2016-12-17 21:05:07.000000000 +0100
-+++ Modules/_multiprocessing/semaphore.c	2016-12-31 17:42:30.429238082 +0100
-@@ -382,9 +382,10 @@
- 
-         /* This check is not an absolute guarantee that the semaphore
-            does not rise above maxvalue. */
-+        int res = sem_getvalue(self->handle, &sval);
--        if (sem_getvalue(self->handle, &sval) < 0) {
-+        if (res < 0) {
-             return PyErr_SetFromErrno(PyExc_OSError);
--        } else if (sval >= self->maxvalue) {
-+        } else if (res == 0 && sval >= self->maxvalue) {
-            PyErr_SetString(PyExc_ValueError, "semaphore or lock "
-                            "released too many times");
-            return NULL;

srcpkgs/python/template

@@ -4,7 +4,7 @@
 #
 pkgname=python
 version=2.7.13
-revision=4
+revision=5
 wrksrc="Python-${version}"
 hostmakedepends="pkg-config"
 makedepends="
@@ -26,6 +26,10 @@ alternatives="
  python:python:/usr/bin/python2.7
  python:python.1:/usr/share/man/man1/python2.7.1"
 
+case "$XBPS_TARGET_MACHINE" in
+	i686*)	CFLAGS="-DHAVE_BROKEN_SEM_GETVALUE=1" ;;
+esac
+
 pre_configure() {
 	# Ensure that internal copies of expat, libffi and zlib are not used.
 	rm -r Modules/expat