getdeps: enable the INSTALL_PYTHON_LIB option for Eden builds on Windows

Summary: Enable `INSTALL_PYTHON_LIB=ON` for internal builds of Eden on Windows.

Reviewed By: pkaush

Differential Revision: D19060630

fbshipit-source-id: 40d4f8784958fbeaad4f0d332c55fa0cb810cb5e

build/fbcode_builder/manifests/eden

@@ -48,3 +48,6 @@ fbcode/tools/lfs = tools/lfs
 [shipit.strip]
 ^fbcode/eden/fs/eden-config\.h$
 ^fbcode/eden/hg/.*$
+
+[cmake.defines.all(fb=on,os=windows)]
+INSTALL_PYTHON_LIB=ON