Use pkg-config to search for PETSc

CMakeLists.txt

packages/cmake-modules/.gitrepo

packages/cmake-modules/CorrectWindowsPaths.cmake

packages/cmake-modules/FindFFTW.cmake

packages/cmake-modules/FindGSL.cmake

packages/cmake-modules/FindGit.cmake

packages/cmake-modules/FindITAPS.cmake

packages/cmake-modules/FindNetCDF.cmake

packages/cmake-modules/FindPETSc.cmake

packages/cmake-modules/FindPackageMultipass.cmake

packages/cmake-modules/LICENSE

packages/cmake-modules/README

packages/cmake-modules/ResolveCompilerPaths.cmake