[REVERTME] add exceptions to compile rpclib

Use a method like format.h to switch to -fnoexception

Author: facchinm

variants/ENVIE_M4/cxxflags.txt

@@ -12,7 +12,6 @@
 -ffunction-sections
 -fmessage-length=0
 -fno-delete-null-pointer-checks
--fno-exceptions
 -fomit-frame-pointer
 -funsigned-char
 -g1