Fix all media plugins failure on Windows

Uncomment a couple of commented out lines out in
indra/llplugin/slplugin.cpp and adjust to something like:

LLError::setTagLevel("Plugin", LLError::LEVEL_DEBUG);
LLError::logToFile("C:\\Users\\erik\\AppData\\Roaming\\Megapahit\\logs\\slplugin.log");

I got
"The requested service provider could not be loaded or initialized"

This really helped me solve it:
https://travis-ci.community/t/socket-the-requested-service-provider-could-not-be-loaded-or-initialized/1127

1 files changed, 3 insertions, 0 deletions

diff --git a/indra/llplugin/llpluginprocessparent.cpp b/indra/llplugin/llpluginprocessparent.cpp
index 19a0ce639a..9e4640d20a 100644
--- a/indra/llplugin/llpluginprocessparent.cpp
+++ b/indra/llplugin/llpluginprocessparent.cpp
@@ -275,6 +275,9 @@ void LLPluginProcessParent::init(const std::string &launcher_filename, const std
 {
     mProcessParams.executable = launcher_filename;
     mProcessParams.cwd = plugin_dir;
+#if LL_WINDOWS
+    mProcessParams.envs.add(llformat("SYSTEMROOT=%s", getenv("SYSTEMROOT")));
+#endif
     mPluginFile = plugin_filename;
     mPluginDir = plugin_dir;
     mCPUUsage = 0.0f;