Fix combining C and Fortran. Closes #8377.

test cases/fortran/9 cpp/meson.build

diff --git a/test cases/fortran/9 cpp/meson.build b/test cases/fortran/9 cpp/meson.build
index 7f73985..4a0a896 100644
--- a/test cases/fortran/9 cpp/meson.build
+++ b/test cases/fortran/9 cpp/meson.build
@@ -1,4 +1,4 @@
-project('C++ and FORTRAN', 'cpp', 'fortran')
+project('C++ and FORTRAN', 'c', 'cpp', 'fortran')
 
 cpp = meson.get_compiler('cpp')
 fc = meson.get_compiler('fortran')
@@ -17,9 +17,17 @@
 endif
 
 e = executable(
+  'cfort',
+  ['main.c', 'fortran.f'],
+  dependencies : link_with,
+)
+
+test('C and Fortran', e)
+
+e2 = executable(
   'cppfort',
   ['main.cpp', 'fortran.f'],
   dependencies : link_with,
 )
 
-test('C++ FORTRAN', e)
+test('C++ and Fortran', e2)