Test for posargs being before kwargs.

test cases/failing/15 kwarg before arg/meson.build

@@ -0,0 +1,3 @@
+project('kwarg before arg', 'c')
+
+executable(sources : 'prog.c', 'prog')

test cases/failing/15 kwarg before arg/prog.c

@@ -0,0 +1 @@
+int main(int argc, char **argv) { return 0; }