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Fix compilation errors in mpi/halo3d* and mpi/sweep3d#4

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Fix compilation errors in mpi/halo3d* and mpi/sweep3d#4
samuelkgutierrez wants to merge 1 commit intosstsimulator:masterfrom
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Add -D_POSIX_C_SOURCE=200809L to fix the following:

  • error: variable has incomplete type 'struct timespec'
  • warning: implicit declaration of function 'nanosleep' is invalid in C99

Tested using the following compilers on Fedora 30, Fedora 33:

  • gcc (GCC) 9.3.1 20200408 (Red Hat 9.3.1-2)
  • gcc (GCC) 10.2.1 20201125 (Red Hat 10.2.1-9)
  • clang version 8.0.0 (Fedora 8.0.0-3.fc30)

Please see: https://man7.org/linux/man-pages//man2/nanosleep.2.html

Add -D_POSIX_C_SOURCE=200809L to fix the following:
* error: variable has incomplete type 'struct timespec'
* warning: implicit declaration of function 'nanosleep' is invalid in C99

Tested using the following compilers on Fedora 30, Fedora 33:
* gcc (GCC) 9.3.1 20200408 (Red Hat 9.3.1-2)
* gcc (GCC) 10.2.1 20201125 (Red Hat 10.2.1-9)
* clang version 8.0.0 (Fedora 8.0.0-3.fc30)

Please see: https://man7.org/linux/man-pages//man2/nanosleep.2.html
@samuelkgutierrez
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@Lcjacobpd you may be interested in this.

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