Fix undefined memcpy@@GLIBC_2.14 runtime error

Pre-include gcc-preinclude.h in a few more places to ensure that we
don't pick up a reference to the memcpy@@GLIBC_2.14 symbol.

Fixes add-on loading on systems with an old glibc, such as RHEL <= 6.

Closes out mapbox/node-sqlite3#433.

binding.gyp

@@ -31,6 +31,7 @@
         }
         ]
       ],
+      "cflags": [ "-include ../src/gcc-preinclude.h" ],
       "sources": [
         "src/database.cc",
         "src/node_sqlite3.cc",

deps/sqlite3.gyp

@@ -71,6 +71,7 @@
       'dependencies': [
         'action_before_build'
       ],
+      'cflags': [ '-include ../src/gcc-preinclude.h' ],
       'sources': [
         '<(SHARED_INTERMEDIATE_DIR)/sqlite-autoconf-<@(sqlite_version)/sqlite3.c'
       ],