Revert "libobs/util: Reject plugins linking Qt5 library for Linux"

This reverts commit 615728fa3be71e928842285ce3ba8f7133d1ad22.

Includes partial revert of 62429135ba502027bbab99b2ac16506cb1c0c98f.

libobs/util/platform-nix.c

@@ -14,14 +14,6 @@
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
-#include "obsconfig.h"
-
-#if !defined(__APPLE__) && OBS_QT_VERSION == 6
-#define _GNU_SOURCE
-#include <link.h>
-#include <stdlib.h>
-#endif
-
 #include <stdio.h>
 #include <errno.h>
 #include <sys/types.h>
@@ -37,6 +29,8 @@
 #include <signal.h>
 #include <uuid/uuid.h>
 
+#include "obsconfig.h"
+
 #if !defined(__APPLE__)
 #include <sys/times.h>
 #include <sys/wait.h>
@@ -110,50 +104,10 @@ void os_dlclose(void *module)
 		dlclose(module);
 }
 
-#if !defined(__APPLE__) && OBS_QT_VERSION == 6
-int module_has_qt5_check(const char *path)
-{
-	void *mod = dlopen(path, RTLD_LAZY);
-	if (mod == NULL) {
-		return 1;
-	}
-
-	struct link_map *list = NULL;
-	if (dlinfo(mod, RTLD_DI_LINKMAP, &list) == 0) {
-		for (struct link_map *ptr = list; ptr; ptr = ptr->l_next) {
-			if (strstr(ptr->l_name, "libQt5") != NULL) {
-				return 0;
-			}
-		}
-	}
-
-	return 1;
-}
-
-bool has_qt5_dependency(const char *path)
-{
-	pid_t pid = fork();
-	if (pid == 0) {
-		_exit(module_has_qt5_check(path));
-	}
-	if (pid < 0) {
-		return false;
-	}
-	int status;
-	if (waitpid(pid, &status, 0) < 0) {
-		return false;
-	}
-	return WIFEXITED(status) && WEXITSTATUS(status) == 0;
-}
-#endif
-
 void get_plugin_info(const char *path, bool *is_obs_plugin, bool *can_load)
 {
 	*is_obs_plugin = true;
 	*can_load = true;
-#if !defined(__APPLE__) && OBS_QT_VERSION == 6
-	*can_load = !has_qt5_dependency(path);
-#endif
 	UNUSED_PARAMETER(path);
 }