[adwaita-icon-theme] Visual Studio builds: Support ARM64 builds better

[Chun-wei Fan <fanchunwei src gnome org>]

commit ae0e0617b8f1425e177acce3532173b4c8155d81
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Tue Jul 14 18:01:24 2020 +0800

    Visual Studio builds: Support ARM64 builds better
    
    Add detection logic for ARM64 builds, so that we can construct a default prefix
    for such builds easier.  Also make Visual Studio 2017 and 2019 builds distinct
    from 2015 builds.

 win32/detectenv-msvc.mak | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)
---
diff --git a/win32/detectenv-msvc.mak b/win32/detectenv-msvc.mak
index 6fd96ccc..29b73d88 100644
--- a/win32/detectenv-msvc.mak
+++ b/win32/detectenv-msvc.mak
@@ -21,6 +21,8 @@ _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
@@ -42,8 +44,10 @@ VSVER = 11
 VSVER = 12
 !elseif $(VCVERSION) > 1899 && $(VCVERSION) < 1910
 VSVER = 14
-!elseif $(VCVERSION) > 1909 && $(VCVERSION) < 2000
+!elseif $(VCVERSION) > 1909 && $(VCVERSION) < 1920
 VSVER = 15
+!elseif $(VCVERSION) > 1919 && $(VCVERSION) < 2000
+VSVER = 16
 !else
 VSVER = 0
 !endif
@@ -51,7 +55,7 @@ VSVER = 0
 !if "$(VSVER)" == "0"
 MSG = ^
 This NMake Makefile set supports Visual Studio^
-9 (2008) through 14 (2015).  Your Visual Studio^
+9 (2008) through 16 (2019).  Your Visual Studio^
 version is not supported.
 !error $(MSG)
 !endif
@@ -73,6 +77,8 @@ CFLAGS_ADD = /MDd /Od $(CFLAGS_BASE)
 
 !if "$(PLAT)" == "x64"
 LDFLAGS_ARCH = /machine:x64
+!elseif "$(PLAT)" == "arm64"
+LDFLAGS_ARCH = /machine:arm64
 !else
 LDFLAGS_ARCH = /machine:x86
 !endif