Hi Budo,
I don't think your approach is the right one, working against the package 
maintainer's intent to provide both types of libraries, one with -fPIC and one 
without.
Check out my update to Debian bug #684116: the package already builds a 
libsuitesparseconfig_pic.a and simply misses to include it in the binary .deb 
file. I noticed when going through the patches that were already in the package 
before yours.

** Patch added: "include libsuitesparseconfig_pic.a in libsuitesparse-dev"
   
https://bugs.launchpad.net/ubuntu/+source/suitesparse/+bug/1319687/+attachment/4322785/+files/fix-684116.patch

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https://bugs.launchpad.net/bugs/1319687

Title:
  SuiteSparse fails to link in shared library due to missing -fPIC in
  libsuitesparseconfig.a

Status in suitesparse package in Ubuntu:
  Confirmed

Bug description:
  The config library is only available as a .a which is not compiled
  with -fPIC. Thus, linking into shared libraries fails on AMD64.

  Attaching a minimal program to trigger the bug.

  gcc -shared -fPIC -o test.so suitetest.cpp -lumfpack
  -lsuitesparseconfig

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