Update compile_example.sh to use realitve path and c11 flag

Older gcc versions only compile c11 if the -std=c11 flag is set. Further this script assumed goto-gcc to be on the path.
This is no longer required.

Author: mmuesly

regression/memory-analyzer/compile_example.sh

@@ -6,5 +6,5 @@ set -e
 
 NAME=${5%.exe}
 
-goto-gcc -g -o $NAME.exe $NAME.c
+../../../src/goto-cc/goto-gcc -g -std=c11 -o $NAME.exe $NAME.c
 $MEMORYANALYZER $@