lib/util_lib/util.c should use PERL_HEADER value

[EricDeveaud]

Hello,

I noticed that lib/util_lib/util.c uses plain system call for perl in perl_strstr

see:

printf_system_direct("perl -e '$s=\"%s\";$x=($s=~/%s/);$x=($x==1)?1:0;print $x;'>%s", string2, pattern,tmp);

it may be more coherent to use the same perl than the one defined in PERL_HEADER

regards

Eric