[ET Trac] #2903: have pkg-config code path in `find_lib` set `FOO_RAW_INC_DIRS` and `FOO_RAW_LIB_DIRS`

[Roland Haas]

#2903: have pkg-config code path in `find_lib` set `FOO_RAW_INC_DIRS` and `FOO_RAW_LIB_DIRS`

 Reporter: Roland Haas
   Status: new
Milestone: 
  Version: 
     Type: bug
 Priority: major
Component: Cactus

These variables contain the directory paths before the well-known system directories have been stripped out. To support this with pkg-config one has to avoid pkg-config itself doing the stripping by setting `PKG_CONFIG_ALLOW_SYSTEM_CFLAGS=1` and the same for LIBS.

See #2875 for a bit more context, though all ExternalLibraries `detect.sh` scripts that parse header files are affected.

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2903/have-pkg-config-code-path-in-find_lib-set
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