add library: gsl

[jeroen]

Seems to work with CRAN package gsl:

...
emcc -s SIDE_MODULE=1 -s WASM_BIGINT -s ASSERTIONS=1 -L/opt/webr/wasm/lib -L/opt/webr/wasm/R-4.3.0/lib/R/lib -s USE_BZIP2=1 -s USE_ZLIB=1 -fwasm-exceptions -s SUPPORT_LONGJMP=wasm -Oz -o gsl.so airy.o bessel.o clausen.o coulomb.o coupling.o dawson.o debye.o dilog.o ellint.o elljac.o error.o expint.o fermi_dirac.o gamma.o gegenbauer.o hyperg.o init.o laguerre.o lambert.o legendre.o log.o poly.o pow_int.o psi.o qrng.o rng.o synchrotron.o transport.o trig.o vector.o zeta.o -L/opt/webr/wasm/lib -lgsl -lgslcblas -lm
installing to /tmp/RtmpC56q0r/file213f33e8666e/gsl/libs
** R
** inst
** preparing package for lazy loading
** help
*** installing help indices
*** copying figures
** building package indices
** installing vignettes
* creating tarball
packaged installation of 'gsl' as 'gsl_2.1-8_R_x86_64-pc-linux-gnu.tar.gz'
* DONE (gsl)
Packaging: gsl_2.1-8.data

[jeroen]

Test with r-universe:

install.packages('gsl', repos = 'https://robinhankin.r-universe.dev')
library(gsl)
example(coulomb_wave_FG)

[georgestagg]

Confirmed, working at my end too!