Move trace into its own library in libs.

Apparently it has no testing variant.

src/include.am

@@ -2,6 +2,7 @@ include src/ext/include.am
 include src/lib/err/include.am
 include src/lib/ctime/include.am
 include src/lib/compress/include.am
+include src/lib/trace/include.am
 include src/common/include.am
 include src/trunnel/include.am
 include src/or/include.am
@@ -11,4 +12,3 @@ include src/tools/include.am
 include src/win32/include.am
 include src/config/include.am
 include src/test/fuzz/include.am
-include src/trace/include.am

src/lib/trace/include.am

@@ -0,0 +1,18 @@
+
+noinst_LIBRARIES += \
+	src/lib/libtor-trace.a
+
+TRACEHEADERS = \
+	src/lib/trace/trace.h \
+	src/lib/trace/events.h
+
+if USE_EVENT_TRACING_DEBUG
+TRACEHEADERS += \
+	src/lib/trace/debug.h
+endif
+
+# Library source files.
+src_lib_libtor_trace_a_SOURCES = \
+	src/lib/trace/trace.c
+
+noinst_HEADERS+= $(TRACEHEADERS)

src/trace/include.am

@@ -1,19 +0,0 @@
-
-noinst_LIBRARIES += \
-	src/trace/libor-trace.a
-LIBOR_TRACE_A_SOURCES = \
-	src/trace/trace.c
-
-TRACEHEADERS = \
-	src/trace/trace.h \
-	src/trace/events.h
-
-if USE_EVENT_TRACING_DEBUG
-TRACEHEADERS += \
-	src/trace/debug.h
-endif
-
-# Library source files.
-src_trace_libor_trace_a_SOURCES = $(LIBOR_TRACE_A_SOURCES)
-
-noinst_HEADERS+= $(TRACEHEADERS)