[Issue 23402] importc function definitions from includes can cause D name conflicts

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23402

--- Comment #4 from Walter Bright <bugzilla at digitalmars.com> ---

---- foo.c ------
#include <math.h>

int main() {}
---------

Now compiles without error. Though this has nothing to do with Adam's report.

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