NMake Makefiles: Support up to VS2022 and ARM64 builds

Make VS2017, 2019 and 2022 builds distinct from Visual Studio 2015 builds, and
add proper configuration for ARM64 builds.

Makefile.vc

@@ -95,7 +95,7 @@ clean:
 	@-del /f /q $(CFG)\$(PLAT)\*.ilk
 	@-del /f /q $(CFG)\$(PLAT)\pkg-config\*.obj
 	@-rmdir /s /q $(CFG)\$(PLAT)
-	@-del vc$(VSVER)0.pdb
+	@-del vc$(PDBVER).pdb
 	@-del config.h
 
 !else

detectenv-msvc.mak

@@ -16,6 +16,8 @@ _HASH=^#
     && ![echo PLAT=Win32 >> vercl.x] \
     && ![echo $(_HASH)elif defined(_M_AMD64) >> vercl.x] \
     && ![echo PLAT=x64 >> vercl.x] \
+    && ![echo $(_HASH)elif defined(_M_ARM64) >> vercl.x] \
+    && ![echo PLAT=arm64 >> vercl.x] \
     && ![echo $(_HASH)endif >> vercl.x] \
     && ![cl -nologo -TC -P vercl.x $(ERRNUL)]
 !include vercl.i
@@ -35,8 +37,14 @@ VSVER = 10
 VSVER = 11
 !elseif $(VCVERSION) > 1799 && $(VCVERSION) < 1900
 VSVER = 12
-!elseif $(VCVERSION) > 1899 && $(VCVERSION) < 2000
+!elseif $(VCVERSION) > 1899 && $(VCVERSION) < 1910
 VSVER = 14
+!elseif $(VCVERSION) > 1909 && $(VCVERSION) < 1920
+VSVER = 15
+!elseif $(VCVERSION) > 1919 && $(VCVERSION) < 1930
+VSVER = 16
+!elseif $(VCVERSION) > 1929 && $(VCVERSION) < 2000
+VSVER = 17
 !else
 VSVER = 0
 !endif
@@ -44,11 +52,17 @@ VSVER = 0
 !if "$(VSVER)" == "0"
 MSG = ^
 This NMake Makefile set supports Visual Studio^
-9 (2008) through 14 (2015).  Your Visual Studio^
+9 (2008) through 17 (2022).  Your Visual Studio^
 version is not supported.
 !error $(MSG)
 !endif
 
+!if $(VSVER) < 15
+PDBVER = $(VSVER)0
+!else
+PDBVER = 140
+!endif
+
 VALID_CFGSET = FALSE
 !if "$(CFG)" == "release" || "$(CFG)" == "debug"
 VALID_CFGSET = TRUE
@@ -62,6 +76,8 @@ CFLAGS_ADD = /MDd /Od
 
 !if "$(PLAT)" == "x64"
 LDFLAGS_ARCH = /machine:x64
+!elseif "$(PLAT)" == "arm64"
+LDFLAGS_ARCH = /machine:arm64
 !else
 LDFLAGS_ARCH = /machine:x86
 !endif