Remove CORE_UTIL_EXPORT

[ Merge of http://go/wvgerrit/155070 ]

These functions are internal utilities and should not be exported from
our library.  IIRC, this was added to aid in Windows tests, but this is
no longer needed.

Bug: 236317198
Test: build_and_run_all_unit_tests.sh
Change-Id: I19beb35a15f0f87dc8f968e1dd5302aed9463e54

libwvdrmengine/cdm/util/include/log.h

@@ -77,18 +77,13 @@ struct LoggingUidSetter {
 // This function is supplied for cases where the system layer does not
 // initialize logging.  This is also needed to initialize logging in
 // unit tests.
-CORE_UTIL_EXPORT void InitLogging();
+void InitLogging();
 
 #ifdef __GNUC__
-[[gnu::format(printf, 5, 6)]] CORE_UTIL_EXPORT void Log(const char* file,
-                                                        const char* function,
-                                                        int line,
-                                                        LogPriority level,
-                                                        const char* fmt, ...);
-#else
-CORE_UTIL_EXPORT void Log(const char* file, const char* function, int line,
-                          LogPriority level, const char* fmt, ...);
+[[gnu::format(printf, 5, 6)]]
 #endif
+void Log(const char* file, const char* function, int line,
+         LogPriority level, const char* fmt, ...);
 
 // Log APIs
 #ifdef CDM_DISABLE_LOGGING