Add missing file to Makefile.am.

Failed to notice this because only the cmake build refers to it, and this only makes cmake fail on installation, which was never quite tested.

c++/Makefile.am

@@ -162,7 +162,8 @@ includekj_HEADERS =                                            \
   src/kj/time.h                                                \
   src/kj/async-unix.h                                          \
   src/kj/async-io.h                                            \
-  src/kj/main.h
+  src/kj/main.h                                                \
+  src/kj/windows-sanity.h
 
 includekjparse_HEADERS =                                       \
   src/kj/parse/common.h                                        \

mega-test.cfg

-linux-gcc-4.9     10520 ./super-test.sh tmpdir capnp-gcc-4.9 gcc-4.9
-linux-gcc-4.8      9800 ./super-test.sh tmpdir capnp-gcc-4.8 gcc-4.8
+linux-gcc-4.9     10518 ./super-test.sh tmpdir capnp-gcc-4.9 gcc-4.9
+linux-gcc-4.8      9801 ./super-test.sh tmpdir capnp-gcc-4.8 gcc-4.8
 linux-clang       10616 ./super-test.sh tmpdir capnp-clang clang
-mac                7942 ./super-test.sh remote beat caffeinate
-cygwin             9044 ./super-test.sh remote Kenton@flashman
+mac                7937 ./super-test.sh remote beat caffeinate
+cygwin             9050 ./super-test.sh remote Kenton@flashman
 exotic             5581 ./super-test.sh tmpdir exotic exotic