Work around a weird pgi bug in test/unit/math.c

pgi fails to compile math.c, reporting that `-INFINITY` in `pt_norm_expected[]`
is a "Non-constant" expression. A simplified version of this failure is:

```c
#include <math.h>

static double inf1, inf2 = INFINITY;  // no complaints
static double inf3 = INFINITY;        // suddenly INFINITY is "Non-constant"

int main() { }
```

```sh
PGC-S-0074-Non-constant expression in initializer (t.c: 4)
```

pgi errors on the declaration of inf3, and will compile fine if that line is
removed. I've reported this bug to pgi, but in the meantime I just switched to
using (DBL_MAX + DBL_MAX) to work around this bug.

1 files changed, 4 insertions, 0 deletions

diff --git a/test/unit/math.c b/test/unit/math.c
index ebec77a..adb72be 100644
--- a/test/unit/math.c
+++ b/test/unit/math.c
@@ -5,6 +5,10 @@
 
 #include <float.h>
 
+#ifdef __PGI
+#undef INFINITY
+#endif
+
 #ifndef INFINITY
 #define	INFINITY (DBL_MAX + DBL_MAX)
 #endif