MT#62181 move -std= option

Move from debian/rules into actual makefile. This is not Debian-specific
and needs to be set for a successful build.

Also it's not a preprocessor option, it's a C++ option.

Change-Id: I19be56f4e319778def5697b1fdbc77a9988ccb9b

Makefile.defs

@@ -166,6 +166,7 @@ CXX = g++
 CC = gcc
 LD = $(CC)
 
+CXXFLAGS += -std=c++20
 CXXFLAGS += -Wall -Wno-reorder -Wno-unused -fPIC -g $(EXTRA_CXXFLAGS) 
 CFLAGS   += -Wall -fPIC -g $(EXTRA_CFLAGS)
 

apps/xmlrpc2di/xmlrpc++/Makefile

@@ -6,7 +6,7 @@ CPPFLAGS	+= -I$(SRC) -fPIC -Wno-deprecated-declarations
 DEBUG		= -g
 OPTIMIZE	= -O2
 GCCWARN		= -Wall #-Wstrict-prototypes
-CXXFLAGS	= $(DEBUG) $(GCCWARN) $(OPTIMIZE) $(INCLUDES)
+CXXFLAGS	= -std=c++20 $(DEBUG) $(GCCWARN) $(OPTIMIZE) $(INCLUDES)
 ARFLAGS		= rvs
 VERSION		= 0.8
 

apps/xmlrpc2di/xmlrpc++/test/Makefile

@@ -5,7 +5,7 @@ CPPFLAGS	= -I$(SRC)
 DEBUG		= -g
 #OPTIMIZE	= -O2
 GCCWARN		= -Wall -Wstrict-prototypes
-CXXFLAGS	= $(DEBUG) $(GCCWARN) $(OPTIMIZE) $(INCLUDES)
+CXXFLAGS	= std=c++20 $(DEBUG) $(GCCWARN) $(OPTIMIZE) $(INCLUDES)
 
 LIB		= ../libXmlRpc.a -lssl
 

debian/rules

@@ -9,7 +9,7 @@ EXCLUDED_MODULES=conf_auth examples/db_announce fast_ack gateway ivr mailbox mp3
 EXCLUDED_DSM_MODULES=mod_aws mod_py
 EXCLUDED_DSM_PY_MODULES=mod_aws mod_py
 
-CPPFLAGS += -DHAVE_XMLRPCPP_SSL -std=c++20
+CPPFLAGS += -DHAVE_XMLRPCPP_SSL
 
 export USE_SPANDSP=yes LONG_DEBUG_MESSAGE=yes CPPFLAGS="$(CPPFLAGS)"