fix bug in mac

cmake/FindMYSQL.cmake

@@ -17,7 +17,7 @@
 include(CheckCXXSourceCompiles)
 
 if(WIN32)
-   find_path(MYSQL_INCLUDE_DIR mysql.h
+   find_path(MYSQL_INCLUDE_DIR mysql/mysql.h
       PATHS
       $ENV{MYSQL_INCLUDE_DIR}
       $ENV{MYSQL_DIR}/include
@@ -26,7 +26,7 @@ if(WIN32)
       $ENV{ProgramW6432}/MySQL/*/include
    )
 else(WIN32)
-   find_path(MYSQL_INCLUDE_DIR mysql.h
+   find_path(MYSQL_INCLUDE_DIR mysql/mysql.h
       PATHS
       $ENV{MYSQL_INCLUDE_DIR}
       $ENV{MYSQL_DIR}/include
@@ -126,4 +126,4 @@ else(MYSQL_INCLUDE_DIR AND MYSQL_EMBEDDED_LIBRARIES AND HAVE_MYSQL_OPT_EMBEDDED_
    message(STATUS "MySQL Embedded not found.")
 endif(MYSQL_INCLUDE_DIR AND MYSQL_EMBEDDED_LIBRARIES AND HAVE_MYSQL_OPT_EMBEDDED_CONNECTION)
 
-mark_as_advanced(MYSQL_INCLUDE_DIR MYSQL_LIBRARIES MYSQL_EMBEDDED_LIBRARIES)
\ No newline at end of file
+mark_as_advanced(MYSQL_INCLUDE_DIR MYSQL_LIBRARIES MYSQL_EMBEDDED_LIBRARIES)