compile Scotch with -U_FORTIFY_SOURCE (fixes buffer overflow error for mmg in Ubuntu 24)

Author: phtournier

3rdparty/scotch/Makefile-scotch.inc

@@ -24,7 +24,7 @@ CFLAGSWIN =  -DCOMMON_PTHREAD -DCOMMON_PTHREAD_BARRIER -DCOMMON_RANDOM_FIXED_SEE
 # CFLAGSSTD = -DCOMMON_STUB_FORK  -DCOMMON_RANDOM_FIXED_SEED -DCOMMON_TIMING_OLD -DSCOTCH_RENAME -DSCOTCH_DETERMINISTIC
 #  reomve -DSCOTCH_PTHREAD due to (1): ERROR: SCOTCH_dgraphInit: Scotch compiled with SCOTCH_PTHREAD and program not launched with MPI_THREAD_MULTIPLE
 # in SUPERLU_DIST solver ..  FH. Sep 2016 v 3.48
-CFLAGSSTD = -DCOMMON_PTHREAD -DCOMMON_PTHREAD_BARRIER -DCOMMON_RANDOM_FIXED_SEED -DCOMMON_TIMING_OLD  -DSCOTCH_RENAME
+CFLAGSSTD = -U_FORTIFY_SOURCE -DCOMMON_PTHREAD -DCOMMON_PTHREAD_BARRIER -DCOMMON_RANDOM_FIXED_SEED -DCOMMON_TIMING_OLD  -DSCOTCH_RENAME
 
 ifeq (@WIN32DLLTARGET@,)
 CFLAGS	= @CFLAGS@ -I'@MPI_INC_DIR@' $(FFINTSCOTCH) -Drestrict=__restrict $(CFLAGSSTD)