build-release: enable OpenMP on MinGW, also copy libgomp from MinGW

Author: illwieckz

build-release

@@ -539,6 +539,8 @@ build () {
 
 		if "${system_windows}"
 		then
+			cmake_opts="${cmake_opts} -DUSE_OPENMP=ON"
+
 			if "${arch_i686}"
 			then
 				engine_file_list="${engine_file_list} nacl_loader-amd64.exe irt_core-amd64.nexe" # WOW64 support
@@ -547,7 +549,7 @@ build () {
 				special_dll='libgcc_s_seh-1.dll'
 			fi
 
-			extra_dll_list="${special_dll} libstdc++-6.dll libwinpthread-1.dll libssp-0.dll"
+			extra_dll_list="${special_dll} libgomp-1.dll libstdc++-6.dll libwinpthread-1.dll libssp-0.dll"
 			# DLLs are added to engine_file_list after building
 			engine_file_list="${engine_file_list} daemon.exe daemonded.exe daemon-tty.exe crash_server.exe nacl_loader.exe"
 			engine_symbolize_list='daemon.exe daemonded.exe daemon-tty.exe'