bpo-14976: Reentrant simple queue (#3346)

Add a queue.SimpleQueue class, an unbounded FIFO queue with a reentrant C implementation of put().
diff --git a/PCbuild/pcbuild.sln b/PCbuild/pcbuild.sln
index 82cfaf2..5ff86a4 100644
--- a/PCbuild/pcbuild.sln
+++ b/PCbuild/pcbuild.sln
@@ -89,6 +89,8 @@
 EndProject
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "_asyncio", "_asyncio.vcxproj", "{384C224A-7474-476E-A01B-750EA7DE918C}"
 EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "_queue", "_queue.vcxproj", "{78D80A15-BD8C-44E2-B49E-1F05B0A0A687}"
+EndProject
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "liblzma", "liblzma.vcxproj", "{12728250-16EC-4DC6-94D7-E21DD88947F8}"
 EndProject
 Global
@@ -659,6 +661,22 @@
 		{384C224A-7474-476E-A01B-750EA7DE918C}.Release|Win32.Build.0 = Release|Win32
 		{384C224A-7474-476E-A01B-750EA7DE918C}.Release|x64.ActiveCfg = Release|x64
 		{384C224A-7474-476E-A01B-750EA7DE918C}.Release|x64.Build.0 = Release|x64
+		{78D80A15-BD8C-44E2-B49E-1F05B0A0A687}.Debug|Win32.ActiveCfg = Debug|Win32
+		{78D80A15-BD8C-44E2-B49E-1F05B0A0A687}.Debug|Win32.Build.0 = Debug|Win32
+		{78D80A15-BD8C-44E2-B49E-1F05B0A0A687}.Debug|x64.ActiveCfg = Debug|x64
+		{78D80A15-BD8C-44E2-B49E-1F05B0A0A687}.Debug|x64.Build.0 = Debug|x64
+		{78D80A15-BD8C-44E2-B49E-1F05B0A0A687}.PGInstrument|Win32.ActiveCfg = PGInstrument|Win32
+		{78D80A15-BD8C-44E2-B49E-1F05B0A0A687}.PGInstrument|Win32.Build.0 = PGInstrument|Win32
+		{78D80A15-BD8C-44E2-B49E-1F05B0A0A687}.PGInstrument|x64.ActiveCfg = PGInstrument|x64
+		{78D80A15-BD8C-44E2-B49E-1F05B0A0A687}.PGInstrument|x64.Build.0 = PGInstrument|x64
+		{78D80A15-BD8C-44E2-B49E-1F05B0A0A687}.PGUpdate|Win32.ActiveCfg = PGUpdate|Win32
+		{78D80A15-BD8C-44E2-B49E-1F05B0A0A687}.PGUpdate|Win32.Build.0 = PGUpdate|Win32
+		{78D80A15-BD8C-44E2-B49E-1F05B0A0A687}.PGUpdate|x64.ActiveCfg = PGUpdate|x64
+		{78D80A15-BD8C-44E2-B49E-1F05B0A0A687}.PGUpdate|x64.Build.0 = PGUpdate|x64
+		{78D80A15-BD8C-44E2-B49E-1F05B0A0A687}.Release|Win32.ActiveCfg = Release|Win32
+		{78D80A15-BD8C-44E2-B49E-1F05B0A0A687}.Release|Win32.Build.0 = Release|Win32
+		{78D80A15-BD8C-44E2-B49E-1F05B0A0A687}.Release|x64.ActiveCfg = Release|x64
+		{78D80A15-BD8C-44E2-B49E-1F05B0A0A687}.Release|x64.Build.0 = Release|x64
 		{12728250-16EC-4DC6-94D7-E21DD88947F8}.Debug|Win32.ActiveCfg = Debug|Win32
 		{12728250-16EC-4DC6-94D7-E21DD88947F8}.Debug|Win32.Build.0 = Debug|Win32
 		{12728250-16EC-4DC6-94D7-E21DD88947F8}.Debug|x64.ActiveCfg = Debug|x64