8373388: Reenable LTO for libsplashscreen

Reviewed-by: erikj, dholmes, serb, prr

Author: MBaesken

make/modules/java.desktop/lib/ClientLibraries.gmk

@@ -226,6 +226,7 @@ ifeq ($(ENABLE_HEADLESS_ONLY), false)
       EXCLUDE_FILES := imageioJPEG.c jpegdecoder.c pngtest.c, \
       EXCLUDES := $(LIBSPLASHSCREEN_EXCLUDES), \
       OPTIMIZATION := SIZE, \
+      LINK_TIME_OPTIMIZATION := true, \
       CFLAGS := $(LIBSPLASHSCREEN_CFLAGS) \
           $(GIFLIB_CFLAGS) $(LIBJPEG_CFLAGS) $(PNG_CFLAGS) $(LIBZ_CFLAGS) \
           $(ICONV_CFLAGS), \