BSolver: fix build host build for gcc 2

gcc 2 doesn't support the weakref attribute. Rather use the regular
(target) method to initialize sCreateSolver instead (pthread once,
dlopen()). Since we know that we're on Haiku, that doesn't add any
dependencies that aren't available anyway.

src/kits/package/solver/Solver.cpp

@@ -9,16 +9,15 @@
 
 #include <package/solver/Solver.h>
 
-#ifdef HAIKU_TARGET_PLATFORM_HAIKU
-#	include <dlfcn.h>
-#	include <pthread.h>
-#endif
-
 
 typedef BPackageKit::BSolver* CreateSolverFunction();
 
 
-#ifdef HAIKU_TARGET_PLATFORM_HAIKU
+#if defined(HAIKU_TARGET_PLATFORM_HAIKU) || __GNUC__ == 2
+
+
+#include <dlfcn.h>
+#include <pthread.h>
 
 
 static CreateSolverFunction* sCreateSolver = NULL;
@@ -29,7 +28,11 @@ static pthread_once_t sLoadLibsolvSolverAddOnInitOnce = PTHREAD_ONCE_INIT;
 static void
 load_libsolv_solver_add_on()
 {
+#if defined(HAIKU_TARGET_PLATFORM_HAIKU) || __GNUC__ == 2
 	void* imageHandle = dlopen("libpackage-add-on-libsolv.so", 0);
+#else
+	void* imageHandle = dlopen("libpackage-add-on-libsolv_build.so", 0);
+#endif
 	if (imageHandle == NULL)
 		return;