[security/nss] fix install error

[green dog]

fix install error if CC is defined

======

cat /etc/make.conf

CC=/usr/bin/clang
CXX=/usr/bin/clang++
CPP=/usr/bin/clang-cpp

# added by use.perl 2012-08-13 23:14:06
PERL_VERSION=5.14.2

QT4_OPTIONS=


error
# make install
===>  Installing for nss-3.13.6
===>   nss-3.13.6 depends on shared library: nspr4.1 - found
===>   nss-3.13.6 depends on shared library: sqlite3.8 - found
===>   Generating temporary packing list
===>  Checking if security/nss already installed
/bin/mkdir -p /usr/local/include/nss/nss /usr/local/lib/nss
/usr/bin/find /usr/ports/security/nss/work/nss-3.13.6/mozilla/dist/public/nss
-type l  -exec install  -o root -g wheel -m 444 {}
/usr/local/include/nss/nss \;
install  -o root -g wheel -m 444
/usr/ports/security/nss/work/nss-3.13.6/mozilla/dist/FreeBSD9.0_OPT.OBJ/lib/*.so.1
 /usr/local/lib/nss
install: /usr/ports/security/nss/work/nss-3.13.6/mozilla/dist/FreeBSD9.0_OPT.OBJ/lib/*.so.1:
No such file or directory
*** Error code 71

Stop in /usr/ports/security/nss.

# ls /usr/ports/security/nss/work/nss-3.13.6/mozilla/dist
FreeBSD9.0_clang_OPT.OBJ    private				public

=======

if CC=/usr/local/cc then FreeBSD9.0_cc_OPT.OBJ
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