Created attachment 53170 [details]
This patch fixes the fact that valgrind default suppression files are not conditioned based on whether they exist in the source directory or whether they are created anew in the build directory. 

Version:           3.6.0
OS:                Linux

When building valgrind-3.6.0 under ARM/Linux with non-colocated source and build directories, the build fails because the top-level generated make file cannot find most of the suppression files.

Reproducible: Always

Steps to Reproduce:
1. Unarchive the valgrind-3.6.0 archive.
2. Create a directory at the same level as the resulting valgrind-3.6.0 directory, called "build".
3. Change to the directory "build"
4. Run ../valgrind-3.6.0/configure
5. Type 'make' to begin the build.

Actual Results:  
The step where it runs 'cat $(DEFAULT_SUPP_FILES) >> default.supp fails with 'xfree-3.supp': No such file or directory", etc.

Expected Results:  
Each of these suppression files needs to be qualified or search for in both the source or build directory prior to cat'ing them.

The attached patch addresses the issue.