Forgot this one.

test cases/common/43 has function/meson.build

@@ -0,0 +1,11 @@
+project('has function', 'c')
+
+cc = meson.get_compiler('c')
+
+if not cc.has_function('printf', prefix : '#include<stdio.h>')
+  error('Existing function not found.')
+endif
+
+if cc.has_function('hfkerhisadf', prefix : '#include<stdio.h>')
+  error('Found non-existant function.')
+endif