[LyX/master] Cmake build: Try to find hunspell.hxx for linunx _and_ for OSX

[Kornel Benko]

commit 9d0548e8773f58d412368826eb5c0602b5c33403
Author: Kornel Benko <kornel at lyx.org>
Date:   Wed Dec 4 20:23:27 2019 +0100

    Cmake build: Try to find hunspell.hxx for linunx _and_ for OSX
---
 development/cmake/modules/FindHunspell.cmake |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)

diff --git a/development/cmake/modules/FindHunspell.cmake b/development/cmake/modules/FindHunspell.cmake
index ae63f49..ad08ad6 100644
--- a/development/cmake/modules/FindHunspell.cmake
+++ b/development/cmake/modules/FindHunspell.cmake
@@ -5,7 +5,13 @@ else()
   find_library(HUNSPELL_LIBRARY NAMES "hunspell" "hunspell-1.2" PATHS "/usr/local/lib" ${SYSTEM_LIB_DIRS} "/usr/lib64")
 endif()
 
-FIND_PATH(HUNSPELL_INCLUDE_DIR "hunspell/hunspell.hxx")
+FIND_PATH(HUNSPELL_INCLUDE_DIR "hunspell.hxx")
+if (NOT HUNSPELL_INCLUDE_DIR)
+  FIND_PATH(HUNSPELL_INCLUDE_DIR "hunspell/hunspell.hxx")
+  if (HUNSPELL_INCLUDE_DIR)
+    set(HUNSPELL_INCLUDE_DIR "${HUNSPELL_INCLUDE_DIR}/hunspell")
+  endif()
+endif()
 
 # handle the QUIETLY and REQUIRED arguments and
 # set HUNSPELL_FOUND to TRUE if all listed variables are TRUE