update meson build for new layout

Author: kiwifb

src/sage/libs/mpmath/meson.build

@@ -1,16 +1,11 @@
 py.install_sources(
   '__init__.py',
   'all.py',
-  'ext_impl.pxd',
-  'ext_main.pxd',
   'utils.pxd',
   subdir: 'sage/libs/mpmath',
 )
 
 extension_data = {
-  'ext_impl' : files('ext_impl.pyx'),
-  'ext_libmp' : files('ext_libmp.pyx'),
-  'ext_main' : files('ext_main.pyx'),
   'utils' : files('utils.pyx'),
 }
 
@@ -21,7 +16,7 @@ foreach name, pyx : extension_data
     subdir: 'sage/libs/mpmath',
     install: true,
     include_directories: [inc_cpython, inc_ext, inc_rings],
-    dependencies: [py_dep, cysignals, gmp, mpfr],
+    dependencies: [py_dep, cysignals, gmp, gmpy2, mpfr],
   )
 endforeach