python,python3: build bluetooth support if bluez-libs selected

This should hopefully fix the Python3 build on buildbot.

For a while I assumed it may be a build-bot issue, but
then looking through the packages repo [and finding
the bluez package] it looks like, if you try
to build all packages, Python3 detects the bluetooth
headers installed by bluez.

It looks like Python's bluetooth support was somewhat
broken ; it was not detecting the <bluetooth/bluetooth.h>
header, so a backport from Python3 to Python fixed that.

Signed-off-by: Alexandru Ardelean <ardeleanalex@gmail.com>

lang/python/python/patches/005-fix-bluetooth-support.patch

@@ -0,0 +1,61 @@
+diff --git a/configure b/configure
+index 4c0435e..0068a9d 100755
+--- a/configure
++++ b/configure
+@@ -7045,7 +7045,7 @@ sys/param.h sys/poll.h sys/random.h sys/select.h sys/socket.h sys/statvfs.h sys/
+ sys/termio.h sys/time.h \
+ sys/times.h sys/types.h sys/un.h sys/utsname.h sys/wait.h pty.h libutil.h \
+ sys/resource.h netpacket/packet.h sysexits.h bluetooth.h \
+-bluetooth/bluetooth.h linux/tipc.h spawn.h util.h alloca.h
++linux/tipc.h spawn.h util.h alloca.h
+ do :
+   as_ac_Header=`$as_echo "ac_cv_header_$ac_header" | $as_tr_sh`
+ ac_fn_c_check_header_mongrel "$LINENO" "$ac_header" "$as_ac_Header" "$ac_includes_default"
+@@ -7267,6 +7267,24 @@ fi
+ fi
+ 
+ 
++# bluetooth/bluetooth.h has been known to not compile with -std=c99.
++# http://permalink.gmane.org/gmane.linux.bluez.kernel/22294
++SAVE_CFLAGS=$CFLAGS
++CFLAGS="-std=c99 $CFLAGS"
++for ac_header in bluetooth/bluetooth.h
++do :
++  ac_fn_c_check_header_mongrel "$LINENO" "bluetooth/bluetooth.h" "ac_cv_header_bluetooth_bluetooth_h" "$ac_includes_default"
++if test "x$ac_cv_header_bluetooth_bluetooth_h" = xyes; then :
++  cat >>confdefs.h <<_ACEOF
++#define HAVE_BLUETOOTH_BLUETOOTH_H 1
++_ACEOF
++
++fi
++
++done
++
++CFLAGS=$SAVE_CFLAGS
++
+ # On Linux, netlink.h requires asm/types.h
+ for ac_header in linux/netlink.h
+ do :
+diff --git a/configure.ac b/configure.ac
+index 780f275..dceca1c 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -1702,10 +1702,17 @@ sys/param.h sys/poll.h sys/random.h sys/select.h sys/socket.h sys/statvfs.h sys/
+ sys/termio.h sys/time.h \
+ sys/times.h sys/types.h sys/un.h sys/utsname.h sys/wait.h pty.h libutil.h \
+ sys/resource.h netpacket/packet.h sysexits.h bluetooth.h \
+-bluetooth/bluetooth.h linux/tipc.h spawn.h util.h alloca.h)
++linux/tipc.h spawn.h util.h alloca.h)
+ AC_HEADER_DIRENT
+ AC_HEADER_MAJOR
+ 
++# bluetooth/bluetooth.h has been known to not compile with -std=c99.
++# http://permalink.gmane.org/gmane.linux.bluez.kernel/22294
++SAVE_CFLAGS=$CFLAGS
++CFLAGS="-std=c99 $CFLAGS"
++AC_CHECK_HEADERS(bluetooth/bluetooth.h)
++CFLAGS=$SAVE_CFLAGS
++
+ # On Linux, netlink.h requires asm/types.h
+ AC_CHECK_HEADERS(linux/netlink.h,,,[
+ #ifdef HAVE_ASM_TYPES_H