libhtml-tree-perl: fix shebang

There is a build failure while installing libhtml-tree-perl to sdk:
...
|Computing transaction...error: Can't install nativesdk-libhtml-tree-
perl-5.03-r0.1@x86_64_nativesdk: no package provides tmp/sysroots/
x86_64-linux/usr/bin/perl-native/perl.real
...

The rpm detects the shebang of perl script, so we correct it.
Signed-off-by: Hongxu Jia <hongxu.jia@windriver.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>