package/Makefile.in: replace invocation of tempfile w/ mktemp in try-run

package/Makefile.in: replace invocation of tempfile w/ mktemp in try-run

mktemp is included in GNU Coreutils, and its usage is preferred over
tempfile.

http://lists.gnu.org/archive/html/bug-coreutils/2007-10/msg00134.html

Additionally, some distributions no longer package tempfile, causing
the try-run macro to not work as expected. For example, due to try-run
not behaving as expected, testing for the -no-pie option in the
aespipe package doesn't work, and we build without -no-pie, causing a
build failure.

See also commit 91a08ecc998 (package/Makefile.in: add host-cc-option
macro) which introduced that initial code, explicitly to add -no-pie
when needed.

Fixes:
  http://autobuild.buildroot.net/results/db50f4415d18441f94b641ef6dc5a3672678b8b9/
  http://autobuild.buildroot.net/results/76d73f767d3aab3c97d61188f5666899d72ed82d/
  http://autobuild.buildroot.net/results/6aa9031962603354086b49bc49add92fde496ec2/
  http://autobuild.buildroot.net/results/33d22f4d96fb439be8551355290896ef6d3649df/
  http://autobuild.buildroot.net/results/eeec2ed80e147c172ec2d50958b12cfa38b2cc8d/

Signed-off-by: Joseph Kogut <joseph.kogut@gmail.com>
Reviewed-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>