Add missing includes and libs to makefile.nmake

Fixes bugs 7312 and 7310.

src/common/Makefile.nmake

 all: libor.lib libor-crypto.lib libor-event.lib
 
-CFLAGS = /I ..\win32 /I ..\..\..\build-alpha\include
+CFLAGS = /I ..\win32 /I ..\..\..\build-alpha\include /I ..\ext
 
 LIBOR_OBJECTS = address.obj compat.obj container.obj di_ops.obj \
 	log.obj memarea.obj mempool.obj procmon.obj util.obj \

src/or/Makefile.nmake

 all: tor.exe
 
-CFLAGS = /I ..\win32 /I ..\..\..\build-alpha\include /I ..\common
+CFLAGS = /I ..\win32 /I ..\..\..\build-alpha\include /I ..\common \
+    /I ..\ext
 
-LIBS = ..\..\..\build-alpha\lib\libevent.a \
- ..\..\..\build-alpha\lib\libcrypto.a \
- ..\..\..\build-alpha\lib\libssl.a \
- ..\..\..\build-alpha\lib\libz.a \
+LIBS = ..\..\..\build-alpha\lib\libevent.lib \
+ ..\..\..\build-alpha\lib\libcrypto.lib \
+ ..\..\..\build-alpha\lib\libssl.lib \
+ ..\..\..\build-alpha\lib\libz.lib \
  ws2_32.lib advapi32.lib shell32.lib
 
 LIBTOR_OBJECTS = buffers.obj channel.obj channeltls.obj circuitbuild.obj \

src/test/Makefile.nmake

 all: test.exe
 
-CFLAGS = /I ..\win32 /I ..\..\..\build-alpha\include /I ..\common /I ..\or
+CFLAGS = /I ..\win32 /I ..\..\..\build-alpha\include /I ..\common /I ..\or \
+    /I ..\ext
 
 LIBS = ..\..\..\build-alpha\lib\libevent.lib \
  ..\..\..\build-alpha\lib\libcrypto.lib \