external/libebook: Missing include (for std::min)

...as reported now by various Windows builders after
e0f1b5bd94 "Upgrade external/boost to latest
Boost 1.75.0"

Change-Id: Ib1f4ea2ca05003b24347c7233bd06cef7d4c955f
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/108920
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

external/libebook/UnpackedTarball_libebook.mk

@@ -13,8 +13,11 @@ $(eval $(call gb_UnpackedTarball_set_tarball,libebook,$(EBOOK_TARBALL)))
 
 $(eval $(call gb_UnpackedTarball_update_autoconf_configs,libebook))
 
+$(eval $(call gb_UnpackedTarball_set_patchlevel,libebook,0))
+
 $(eval $(call gb_UnpackedTarball_add_patches,libebook, \
     external/libebook/libebook-no-icu-boolean.patch.1 \
+    external/libebook/include.patch \
 ))
 
 # vim: set noet sw=4 ts=4:

external/libebook/include.patch

@@ -0,0 +1,10 @@
+--- src/lib/BBeBCollector.cpp
++++ src/lib/BBeBCollector.cpp
+@@ -7,6 +7,7 @@
+  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+  */
+ 
++#include <algorithm>
+ #include <unordered_map>
+ 
+ #include <librevenge/librevenge.h>