Add missing 'static' keyword

This fixes a compiler warning:

    globaloc.cpp:33:6: warning: no previous extern declaration for
      non-static variable 'global_crash_pixes'
      [-Wmissing-variable-declarations]

Signed-off-by: Stefan Weil <sw@weilnetz.de>

Author: stweil

src/ccutil/globaloc.cpp

@@ -30,7 +30,7 @@
 // Size of thread-id array of pixes to keep in case of crash.
 const int kMaxNumThreadPixes = 32768;
 
-Pix* global_crash_pixes[kMaxNumThreadPixes];
+static Pix* global_crash_pixes[kMaxNumThreadPixes];
 
 void SavePixForCrash(int resolution, Pix* pix) {
 #ifdef __linux__