external/hunspell: Work around -Werror,-Wundef with clang-cl

...when lingucomponent/source/spellcheck/spell/sspellimp.cxx includes
hunspell.hxx

Change-Id: Ibb4b2901a9dfbf7e145281bedeaa9d8daf79aba5

external/hunspell/UnpackedTarball_hunspell.mk

@@ -17,4 +17,10 @@ $(eval $(call gb_UnpackedTarball_set_post_action,hunspell,\
 ))
 endif
 
+$(eval $(call gb_UnpackedTarball_set_patchlevel,hunspell,0))
+
+$(eval $(call gb_UnpackedTarball_add_patches,hunspell, \
+    external/hunspell/clangcl-werror.patch \
+))
+
 # vim: set noet sw=4 ts=4:

external/hunspell/clangcl-werror.patch

+--- src/hunspell/hunspell.hxx
++++ src/hunspell/hunspell.hxx
+@@ -85,7 +85,7 @@
+ #define MAXSHARPS 5
+ #define MAXWORDLEN 176
+ 
+-#if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 1)
++#if defined __GNUC__ && (__GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 1))
+ #  define H_DEPRECATED __attribute__((__deprecated__))
+ #elif defined(_MSC_VER) && (_MSC_VER >= 1300)
+ #  define H_DEPRECATED __declspec(deprecated)