[GPUJIT] Disabled gcc's -Wpedantic for use of dlsym
GCC's ISO C standard does not strictly define the bahavior of converting
a void* pointer to a function pointer, but dlsym's POSIX standard
The retrieval of function pointers through dlsym in this case
generates an unnecessary amount of warnings for every API function
assignment, bloating the output.
This patch removes GCC's -Wpedantic flag for retrieval and assignment
of these functions. This simplifies debugging the output of GPUJIT.
Differential Revision: https://reviews.llvm.org/D33008