add missing dependency on GMP in R 3.2.3 easyconfigs (REVIEW)

[boegel]

Without this:

$ module load R/3.2.3-intel-2016a
$ ldd $EBROOTR/lib64/R/library/igraph/libs/igraph.so | grep libgmp
    libgmp.so.3 => /usr/lib64/libgmp.so.3 (0x00002aaaaccde000)

You can force the reinstallation of only igraph with:

$ module load R/3.2.3-intel-2016a
$ rm -rf $EBROOTR/lib64/R/library/igraph
$ module unload R
$ eb R-3.2.3-intel-2016a.eb -dfk
$ module load R/3.2.3-intel-2016a
$ ldd $EBROOTR/lib64/R/library/igraph/libs/igraph.so | grep libgmp
    libgmp.so.10 => /user/scratch/gent/vsc400/vsc40023/easybuild_REGTEST/SL6/sandybridge/software/GMP/6.1.0-intel-2016a/lib/libgmp.so.10 (0x00002aaaaccde000)

[wpoely86]

👍

[boegel]

Test report by @boegel
SUCCESS
Build succeeded for 4 out of 4 (4 easyconfigs in this PR)
node2159.delcatty.os - Linux SL 6.7, Intel(R) Xeon(R) CPU E5-2670 0 @ 2.60GHz, Python 2.6.6
See https://gist.github.com/db8d6286469b76edbcbf1a814c383227 for a full test report.