Fix missing pipe.api.h
Errors occur when building a library outside the VPP
source tree that uses the shared memory API because
vnet/devices/pipe/pipe.api.h is not installed but is
included by vnet/vnet_all_api_h.h.
In src/vnet.am, Add vnet/devices/pipe/pipe.api.h to
nobase_include_HEADERS.
@@ -959,7 +959,8 @@ libvnet_la_SOURCES += \
vnet/devices/pipe/pipe.c
nobase_include_HEADERS += \
- vnet/devices/pipe/pipe.h
+ vnet/devices/pipe/pipe.h \
+ vnet/devices/pipe/pipe.api.h
API_FILES += vnet/devices/pipe/pipe.api
