Give mktemp a template in test runner scripts

Some mktemp implementations (e.g., on OS X) don't support mktemp
without arguments.

JerryScript-DCO-1.0-Signed-off-by: Akos Kiss [email protected]

Author: akosthekiss

tools/runners/run-test-suite.sh

@@ -76,7 +76,7 @@ tested=1
 failed=0
 passed=0
 
-ENGINE_TEMP=`mktemp`
+ENGINE_TEMP=`mktemp engine-out.XXXXXXXXXX`
 
 for test in `cat $TEST_FILES`
 do

tools/runners/run-unittests.sh

@@ -38,7 +38,7 @@ tested=1
 failed=0
 passed=0
 
-UNITTEST_TEMP=`mktemp`
+UNITTEST_TEMP=`mktemp unittest-out.XXXXXXXXXX`
 
 for unit_test in $UNITTESTS
 do