MDEV-25195: pam check getgrouplist function

AIX doesn't have getgrouplist so ensure function is checked.

The HAVE_POSIX_GETGROUPLIST check was insufficient.

plugin/auth_pam/CMakeLists.txt

@@ -4,10 +4,11 @@ INCLUDE (CheckFunctionExists)
 CHECK_INCLUDE_FILES (security/pam_ext.h  HAVE_PAM_EXT_H)
 CHECK_INCLUDE_FILES (security/pam_appl.h HAVE_PAM_APPL_H)
 CHECK_FUNCTION_EXISTS (strndup HAVE_STRNDUP)
+CHECK_FUNCTION_EXISTS (getgrouplist HAVE_GETGROUPLIST)
 
 INCLUDE_DIRECTORIES(${CMAKE_CURRENT_BINARY_DIR})
 
-# Check whether getgrouplist uses git_t for second and third arguments.
+# Check whether getgrouplist uses gtid_t for second and third arguments.
 SET(CMAKE_REQUIRED_FLAGS -Werror)
 CHECK_C_SOURCE_COMPILES(
 "
@@ -29,7 +30,7 @@ SET(CMAKE_REQUIRED_LIBRARIES pam)
 CHECK_FUNCTION_EXISTS(pam_syslog HAVE_PAM_SYSLOG)
 SET(CMAKE_REQUIRED_LIBRARIES)
 
-IF(HAVE_PAM_APPL_H)
+IF(HAVE_PAM_APPL_H AND HAVE_GETGROUPLIST)
   FIND_LIBRARY(PAM_LIBRARY pam) # for srpm build-depends detection
   MYSQL_ADD_PLUGIN(auth_pam auth_pam.c LINK_LIBRARIES pam MODULE_ONLY)
 
@@ -42,7 +43,7 @@ IF(HAVE_PAM_APPL_H)
       INSTALL(FILES mapper/user_map.conf DESTINATION ${INSTALL_PAMDATADIR} COMPONENT Server)
     ENDIF()
   ENDIF()
-ENDIF(HAVE_PAM_APPL_H)
+ENDIF()
 
 CONFIGURE_FILE(${CMAKE_CURRENT_SOURCE_DIR}/config.h.cmake
                ${CMAKE_CURRENT_BINARY_DIR}/config_auth_pam.h)