Bug#915481: sludge FTBFS with glew 2.1.0

[Adrian Bunk]

Source: sludge
Version: 2.2.2-1
Severity: serious
Tags: ftbfs

https://tests.reproducible-builds.org/debian/rb-pkg/unstable/amd64/sludge.html

...
mv -f $depbase.Tpo $depbase.Po
In file included from SpriteBankEditorMain.cpp:32:
/usr/include/GL/glext.h:12066:105: error: conflicting declaration 'typedef void (* PFNGLFRAGMENTLIGHTFVSGIXPROC)(GLenum, GLenum, const GLfloat*)'
 typedef void (APIENTRYP PFNGLFRAGMENTLIGHTFVSGIXPROC) (GLenum light, GLenum pname, const GLfloat *params);
                                                                                                         ^
In file included from SpriteBankEditorMain.cpp:28:
/usr/include/GL/glew.h:18734:28: note: previous declaration as 'typedef void (* PFNGLFRAGMENTLIGHTFVSGIXPROC)(GLenum, GLenum, GLfloat*)'
 typedef void (GLAPIENTRY * PFNGLFRAGMENTLIGHTFVSGIXPROC) (GLenum light, GLenum pname, GLfloat* params);
                            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~