Force gcc version to 7.3.0 and mpfr to 3.1.0

Author: facchinm

build.conf

@@ -16,6 +16,9 @@ MPC_SOURCES="http://www.multiprecision.org/downloads"
 # MPFR_VERSION=3.0.0
 # MPC_VERSION=0.9
 
+GCC_VERSION=7.3.0
+MPFR_VERSION=3.1.0
+
 ATMEL_ATMEGA_PACK_VERSION=1.2.203
 ATMEL_ATMEGA_PACK_FILENAME=Atmel.ATmega_DFP.${ATMEL_ATMEGA_PACK_VERSION}
 ATMEL_ATMEGA_PACK_URL=${ATMEL_PACKS_SOURCES}/${ATMEL_ATMEGA_PACK_FILENAME}.atpack

gcc.build.bash

@@ -27,9 +27,6 @@ cd toolsdir/bin
 TOOLS_BIN_PATH=`pwd`
 cd -
 
-MPFR_VERSION=3.1.0
-MPFR_SOURCE=http://ftp.gnu.org/gnu//mpfr/mpfr-3.1.0.tar.bz2
-
 export PATH="$TOOLS_BIN_PATH:$PATH"
 
 if [[ ! -f gmp-${GMP_VERSION}.tar.bz2  ]] ;