Fix meson build configuration for GAP

- Update gapversion script to use .F90 file extensions instead of .f95
- Add -lgomp link argument to meson.build for OpenMP support

These changes fix build issues when building GAP with the meson build system.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: jameskermode

gapversion

@@ -4,10 +4,10 @@
 # of file (or the file GAP_VERSION if it exists). The gapversion
 # is the UNIX timestap of the most recently changed file.
 
-GAP_FILES="descriptors.f95 descriptors_wrapper.f95 \
-  gp_predict.f95 \
-  clustering.f95 gp_fit.f95 \
-  gap_fit_module.f95 gap_fit.f95"
+GAP_FILES="descriptors.F90 descriptors_wrapper.F90 \
+  gp_predict.F90 \
+  clustering.F90 gp_fit.F90 \
+  gap_fit_module.F90 gap_fit.F90"
 
 GAP_ROOT=$(dirname "$0")
 

meson.build

@@ -20,4 +20,5 @@ GAP = library('GAP',
     mpi_dep,
     ],
   link_with : [libAtoms,fox],
+  link_args: ['-lgomp'],
   )