nss: Re-enable -Werror

GCC-11 has fixed the problem [1]

[1] https://gcc.gnu.org/git/gitweb.cgi?p=gcc.git;h=da879e01ecd35737c18be1da3324f4560aba1961
Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-oe/recipes-support/nss/nss_3.63.bb

@@ -121,8 +121,6 @@ do_compile() {
     fi
 
     export NSS_DISABLE_GTESTS=1
-    # see https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99420
-    export NSS_ENABLE_WERROR=0
     # We can modify CC in the environment, but if we set it via an
     # argument to make, nsinstall, a host program, will also build with it!
     #