awk: evaluate all, even superfluous function args

function                                             old     new   delta
evaluate                                            3128    3135      +7

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

testsuite/awk.tests

@@ -87,11 +87,17 @@ BEGIN {
   a=2
   print v (a)
 }'
-testing "'v (a)' is not a function call, it is a concatenation" \
+testing "awk 'v (a)' is not a function call, it is a concatenation" \
 	"awk '$prg' 2>&1" \
 	"12\n" \
 	"" ""
 
+prg='func f(){print"F"};func g(){print"G"};BEGIN{f(g(),g())}'
+testing "awk unused function args are evaluated" \
+	"awk '$prg' 2>&1" \
+	"G\nG\nF\n" \
+	"" ""
+
 
 optional DESKTOP
 testing "awk hex const 1" "awk '{ print or(0xffffffff,1) }'" "4294967295\n" "" "\n"