Reconfigure game asset search paths.

Index: src/resources/pathmanager.c
--- src/resources/pathmanager.c.orig
+++ src/resources/pathmanager.c
@@ -126,12 +126,12 @@ int pm_init(void) {
                 local_path_build(RESOURCE_PATH, bin_base_dir, "resources\\");
                 local_path_build(SHADER_PATH, bin_base_dir, "shaders\\");
                 m_ok = 1;
-            } else if(strcmp(SDL_GetPlatform(), "Linux") == 0) {
+            } else if(strcmp(SDL_GetPlatform(), "Linux") == 0 || strcmp(SDL_GetPlatform(), "OpenBSD") == 0) {
                 // on linux, the resources will be in ../share/games/openomf, relative to the binary
                 // so if openomf is installed to /usr/local/bin,
                 // the resources will be in /usr/local/share/games/openomf
-                local_path_build(RESOURCE_PATH, bin_base_dir, "../share/games/openomf/");
-                local_path_build(SHADER_PATH, bin_base_dir, "../share/games/openomf/shaders/");
+                local_path_build(RESOURCE_PATH, bin_base_dir, "../share/openomf/");
+                local_path_build(SHADER_PATH, bin_base_dir, "../share/openomf/shaders/");
                 m_ok = 1;
             } else if(strcmp(SDL_GetPlatform(), "Mac OS X") == 0) {
                 // on OSX, GetBasePath returns the 'Resources' directory
