cpan.bbclass: Fix CCFLAGS.

We should not just replace CCFLAGS with CFLAGS while compiling, because
this may cause run-time errors with perl's DynaLoader.pm.

Tested on qemux86 with new libnet-libidn-perl bb recipe:

root@qemux86:~# perl -e "use Net::LibIDN"
Not a CODE reference at /usr/lib/perl/5.14.2//DynaLoader.pm line 213.
END failed--call queue aborted at /usr/lib/perl/vendor_perl/5.14.2//Net/LibIDN.pm line 213.
Compilation failed in require at -e line 1.
BEGIN failed--compilation aborted at -e line 1.

(From OE-Core rev: 855211ae7a224f96663862d4a0e58a90d945dd48)

Signed-off-by: Xin Ouyang <Xin.Ouyang@windriver.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/cpan.bbclass

@@ -26,13 +26,14 @@ cpan_do_configure () {
 			test -f $f2 || continue
 			sed -i -e "s:\(PERL_ARCHLIB = \).*:\1${PERL_ARCHLIB}:" \
 				-e 's/perl.real/perl/' \
+				-e "s/^\(CCFLAGS =.*\)/\1 ${CFLAGS}/" \
 				$f2
 		done
 	fi
 }
 
 cpan_do_compile () {
-	oe_runmake PASTHRU_INC="${CFLAGS}" CCFLAGS="${CFLAGS}" LD="${CCLD}"
+	oe_runmake PASTHRU_INC="${CFLAGS}" LD="${CCLD}"
 }
 
 cpan_do_install () {