Stop linking src/tools/* against libevent

changes/bug507.event

@@ -0,0 +1,4 @@
+  o Code simplifications
+    - We no longer need link tor-gencert, tor-resolve, or tor-checkkey
+      against libevent; they don't use them, and our code was already
+      refactored not to force them to use them.

src/tools/Makefile.am

@@ -2,20 +2,18 @@ bin_PROGRAMS = tor-resolve tor-gencert
 noinst_PROGRAMS =  tor-checkkey
 
 tor_resolve_SOURCES = tor-resolve.c
-tor_resolve_LDFLAGS = @TOR_LDFLAGS_libevent@
-tor_resolve_LDADD = ../common/libor.a -lm @TOR_LIBEVENT_LIBS@ @TOR_LIB_WS32@
+tor_resolve_LDFLAGS =
+tor_resolve_LDADD = ../common/libor.a -lm @TOR_LIB_WS32@
 
 tor_gencert_SOURCES = tor-gencert.c
-tor_gencert_LDFLAGS = @TOR_LDFLAGS_zlib@ @TOR_LDFLAGS_openssl@ \
-        @TOR_LDFLAGS_libevent@
+tor_gencert_LDFLAGS = @TOR_LDFLAGS_zlib@ @TOR_LDFLAGS_openssl@
 tor_gencert_LDADD = ../common/libor.a ../common/libor-crypto.a \
-        -lm @TOR_ZLIB_LIBS@ @TOR_LIBEVENT_LIBS@ @TOR_OPENSSL_LIBS@ @TOR_LIB_WS32@ @TOR_LIB_GDI@
+        -lm @TOR_ZLIB_LIBS@ @TOR_OPENSSL_LIBS@ @TOR_LIB_WS32@ @TOR_LIB_GDI@
 
 tor_checkkey_SOURCES = tor-checkkey.c
-tor_checkkey_LDFLAGS = @TOR_LDFLAGS_zlib@ @TOR_LDFLAGS_openssl@ \
-        @TOR_LDFLAGS_libevent@
+tor_checkkey_LDFLAGS = @TOR_LDFLAGS_zlib@ @TOR_LDFLAGS_openssl@
 tor_checkkey_LDADD = ../common/libor.a ../common/libor-crypto.a \
-        -lm @TOR_ZLIB_LIBS@ @TOR_LIBEVENT_LIBS@ @TOR_OPENSSL_LIBS@ @TOR_LIB_WS32@ @TOR_LIB_GDI@
+        -lm @TOR_ZLIB_LIBS@ @TOR_OPENSSL_LIBS@ @TOR_LIB_WS32@ @TOR_LIB_GDI@
 
 SUBDIRS =      tor-fw-helper
 DIST_SUBDIRS = tor-fw-helper