Add System Informer phsvc LPE PoC

systeminformer-phsvc-trusted-host-lpe-poc/build.bat

@@ -0,0 +1,7 @@
+@echo off
+setlocal
+gcc -shared -municode -O2 -Wall -Wextra -o phsvc_rundll_poc.dll poc.c -lshell32
+if errorlevel 1 exit /b 1
+gcc -municode -O2 -Wall -Wextra -DBUILD_EXE -o phsvc_unsigned_client.exe poc.c -lshell32
+if errorlevel 1 exit /b 1
+echo built phsvc_rundll_poc.dll and phsvc_unsigned_client.exe