www/node10: unbreak (restore a deleted patch)

www/node10/files/patch-common.gypi

+--- common.gypi.orig	2021-01-04 14:30:16 UTC
++++ common.gypi
+@@ -512,15 +512,6 @@
+         'libraries': [ '-lelf' ],
+       }],
+       ['OS=="freebsd"', {
+-        'conditions': [
+-          ['"0" < llvm_version < "4.0"', {
+-            # Use this flag because on FreeBSD std::pairs copy constructor is non-trivial.
+-            # Doesn't apply to llvm 4.0 (FreeBSD 11.1) or later.
+-            # Refs: https://lists.freebsd.org/pipermail/freebsd-toolchain/2016-March/002094.html
+-            # Refs: https://svnweb.freebsd.org/ports/head/www/node/Makefile?revision=444555&view=markup
+-            'cflags': [ '-D_LIBCPP_TRIVIAL_PAIR_COPY_CTOR=1' ],
+-          }],
+-        ],
+         'ldflags': [
+           '-Wl,--export-dynamic',
+         ],