and the modified values of the compile-related variables used in "configure".

Make the necessary adjustments in "configure.in" and "scripts/Makefile.am".

This fixes bug#31644
   Values of *FLAGS that were used for building packages is missed in mysqlbug


configure.in:
  Add more variables to the "substitution" list: SAVE_CC, SAVE_CXX, ASFLAGS.
  
  This is necessary so that the "mysqlbug" script can output the variables affecting
  compilation with both their original (on call) and final (modified) values.
  
  This work is related to fixing bug#31644
     Values of *FLAGS that were used for building packages is missed in mysqlbug
scripts/Makefile.am:
  Clearly differ between the original and the modified values of the compile-related
  variables used in "configure".
  
  This is to fix bug#31644
     Values of *FLAGS that were used for building packages is missed in mysqlbug
scripts/mysqlbug.sh:
  Have separate variables "COMP_CALL_INFO" and "COMP_RUN_INFO"
  which contain the original (call parameters, environment) and the modified values
  of the "configure" variables controlling the compile process.
  
  This fixes bug#31644
     Values of *FLAGS that were used for building packages is missed in mysqlbug