perl cflag error in several Makefile.PL

[ Forgive the duplicate, but sourceforge's ui sucks for
"you mean I was supposed to click a box somewhere and
its too late?" Sourceforge is *way* too "helpful". ]

Several net-snmp (version 5.0.6) Makefile.PLs have a
construct like:

$Params{'CCFLAGS'} = `$opts->{'nsconfig'} --cflags`;

which causes build failues on at least redhat 6.2
derivatives, since $Config{ccflags} has an important
-Dbool=char required to compile the most basic XS
extension.

I have attached a patch that fixes my local problem,
but the actual issue may be more general; LIBS may also
be a problem for some people.