Fix build with musl

src/ClipboardFile.cpp

@@ -300,8 +300,8 @@ namespace gsr {
             return;
         }
 
-        struct stat64 stat;
+        struct stat stat;
-        if(fstat64(file_fd, &stat) == -1) {
+        if(fstat(file_fd, &stat) == -1) {
             fprintf(stderr, "gsr ui: error: ClipboardFile::set_current_file: failed to get file size for file %s, error: %s\n", filepath.c_str(), strerror(errno));
             close(file_fd);
             file_fd = -1;
@@ -313,4 +313,4 @@ namespace gsr {
         XSetSelectionOwner(dpy, clipboard_atom, clipboard_window, CurrentTime);
         XFlush(dpy);
     }
-}
+}

src/GlobalHotkeys/GlobalHotkeysLinux.cpp

@@ -3,7 +3,7 @@
 #include <fcntl.h>
 #include <limits.h>
 #include <string.h>
-
+#include <unistd.h>
 extern "C" {
 #include <mgl/mgl.h>
 }

src/Overlay.cpp

@@ -32,6 +32,7 @@
 #include <algorithm>
 #include <inttypes.h>
 #include <math.h>
+#include <unistd.h>
 
 #include <X11/Xlib.h>
 #include <X11/Xutil.h>

src/gui/FileChooser.cpp

@@ -9,6 +9,7 @@
 #include <mglpp/window/Event.hpp>
 #include <mglpp/system/FloatRect.hpp>
 
+#include <limits.h>
 #include <dirent.h>
 #include <sys/stat.h>
 #include <errno.h>
@@ -296,4 +297,4 @@ namespace gsr {
     const std::string& FileChooser::get_current_directory() const {
         return current_directory_text.get_string();
     }
-}
+}

src/main.cpp

@@ -10,6 +10,7 @@
 #include <string.h>
 #include <limits.h>
 #include <malloc.h>
+#include <unistd.h>
 
 #include <mglpp/mglpp.hpp>
 #include <mglpp/system/Clock.hpp>