Lepton: define M_PI if needed with MingW (in addition to MSVC)

See https://github.com/lammps/lammps/pull/1992

Lepton: define M_PI if needed with MingW (in addition to MSVC)
See https://github.com/lammps/lammps/pull/1992
f2bb414f · Giacomo Fiorin · e4a743ad · f2bb414f
Commit f2bb414f authored Apr 13, 2020 by Giacomo Fiorin
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libraries/lepton/src/MSVC_erfc.h libraries/lepton/src/MSVC_erfc.h +5 -1

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--- a/libraries/lepton/src/MSVC_erfc.h
+++ b/libraries/lepton/src/MSVC_erfc.h
@@ -8,9 +8,13 @@
 * (VC11 has _MSC_VER=1700).
 */

-#if defined(_MSC_VER) 
+#if defined(_MSC_VER) || defined(__MINGW32__)
+#if !defined(M_PI)
 #define M_PI 3.14159265358979323846264338327950288
+#endif
+#endif

+#if defined(_MSC_VER)
 #if _MSC_VER <= 1700 // 1700 is VC11, 1800 is VC12 
 /***************************
 *   erf.cpp