[gegl] gcut: fix compiling on Windows

[Øyvind Kolås <ok src gnome org>]

commit 8629dfe5cb9bff402a686d57b827db3948d5a03c
Author: Edward E <develinthedetail gmail com>
Date:   Mon Jul 17 15:30:11 2017 -0500

    gcut: fix compiling on Windows
    
    Neither Windows nor mingw-w64 have setenv(), realpath(), or SIGUSR2

 gcut/gcut.c |    9 +++++++--
 1 files changed, 7 insertions(+), 2 deletions(-)
---
diff --git a/gcut/gcut.c b/gcut/gcut.c
index f64ed37..528443c 100644
--- a/gcut/gcut.c
+++ b/gcut/gcut.c
@@ -12,6 +12,11 @@
 #include <gexiv2/gexiv2.h>
 #endif
 
+#ifdef G_OS_WIN32
+#define realpath(a,b) _fullpath(b,a,_MAX_PATH)
+#define SIGUSR2 (-1) /* quick and dirty, FIXME */
+#endif
+
 /* GEGL edit decision list - a digital video cutter and splicer */
 
 /* take a string and expand {t=v i t=v t=v }  to numeric or string
@@ -1247,8 +1252,8 @@ int main (int argc, char **argv)
     return iconographer_main (argc-1, argv + 1);
   }
 
-  setenv ("GEGL_USE_OPENCL", "no", 1);
-  setenv ("GEGL_MIPMAP_RENDERING", "1", 1);
+  g_setenv ("GEGL_USE_OPENCL", "no", 1);
+  g_setenv ("GEGL_MIPMAP_RENDERING", "1", 1);
 
   init (argc, argv);
   gcut_start_sanity ();