FindMatlab: removing spaces in compiler define
requested to merge raffienficiaud/cmake:FindMatlab/issue-19279-mex-compilation-error-on-attribute into master
Spaces in DLL_EXPORT_SYM=__attribute__ ((visibility (\"default\"))) are causing a compilation error.
This is confirmed to fix #19279 (closed) but it is a blind fix as I do not have the environment to reproduce it.