nall: Use the value of datadir to find the assets dir.

Author: orbea

nall/GNUmakefile

@@ -243,4 +243,5 @@ else
   bindir ?= $(prefix)/bin
   datarootdir ?= $(prefix)/share
   datadir ?= $(datarootdir)
+  flags += -DDATADIR=\"$(datadir)\"
 endif

nall/path.hpp

@@ -137,6 +137,8 @@ inline auto sharedData() -> string {
   result.transform("\\", "/");
   #elif defined(PLATFORM_MACOS)
   string result = "/Library/Application Support/";
+  #elif defined(DATADIR)
+  string result = DATADIR;
   #else
   string result = "/usr/share/";
   #endif