https://bugs.gentoo.org/841746
https://github.com/coin-or/Vol/commit/7b65983cfbf66f9a615c1babcc28a7cd87eee3c4

From: Stefan Vigerske <svigerske@gams.com>
Date: Sat, 1 Feb 2020 17:45:41 +0000
Subject: [PATCH] there should be no need to cast NULL, closes #1

--- a/src/OsiVol/OsiVolSolverInterfaceIO.cpp
+++ b/src/OsiVol/OsiVolSolverInterfaceIO.cpp
@@ -423,10 +423,10 @@ OsiVolSolverInterface::writeMps(const char *filename,
    writer.setMpsData(*getMatrixByCol(), getInfinity(),
 		     getColLower(), getColUpper(),
 		     getObjCoefficients(), 
-		     reinterpret_cast<const char *> (NULL) /*integrality*/,
+		     NULL /*integrality*/,
 		     getRowLower(), getRowUpper(),
-		     reinterpret_cast<const char **> (NULL) /*colnam*/, 
-		     reinterpret_cast<const char **> (NULL) /*rownam*/);
+		     NULL /*colnam*/, 
+		     NULL /*rownam*/);
    std::string fname = filename;
    if (extension)
    { if (extension[0] != '\0' && extension[0] != '.')