win: drop support for windows 8 (libuv#4624)

Fixes: libuv#3889

Author: bnoordhuis

CMakeLists.txt

@@ -186,7 +186,7 @@ set(uv_sources
     src/version.c)
 
 if(WIN32)
-  list(APPEND uv_defines WIN32_LEAN_AND_MEAN _WIN32_WINNT=0x0602 _CRT_DECLARE_NONSTDC_NAMES=0)
+  list(APPEND uv_defines WIN32_LEAN_AND_MEAN _WIN32_WINNT=0x0A00 _CRT_DECLARE_NONSTDC_NAMES=0)
   list(APPEND uv_libraries
        psapi
        user32

Makefile.am

@@ -59,7 +59,7 @@ if WINNT
 uvinclude_HEADERS += include/uv/win.h include/uv/tree.h
 AM_CPPFLAGS += -I$(top_srcdir)/src/win \
                -DWIN32_LEAN_AND_MEAN \
-               -D_WIN32_WINNT=0x0602
+               -D_WIN32_WINNT=0x0A00
 libuv_la_SOURCES += src/win/async.c \
                     src/win/atomicops-inl.h \
                     src/win/core.c \

SUPPORTED_PLATFORMS.md

@@ -4,7 +4,7 @@
 |---|---|---|---|
 | GNU/Linux | Tier 1 | Linux >= 3.10 with glibc >= 2.17 | |
 | macOS | Tier 1 | macOS >= 11 | Currently supported macOS releases |
-| Windows | Tier 1 | >= Windows 8 | VS 2015 and later are supported |
+| Windows | Tier 1 | >= Windows 10 | VS 2015 and later are supported |
 | FreeBSD | Tier 2 | >= 12 | |
 | AIX | Tier 2 | >= 6 | Maintainers: @libuv/aix |
 | IBM i | Tier 2 | >= IBM i 7.2 | Maintainers: @libuv/ibmi |

include/uv/win.h

@@ -20,7 +20,7 @@
  */
 
 #ifndef _WIN32_WINNT
-# define _WIN32_WINNT   0x0600
+# define _WIN32_WINNT   0x0A00
 #endif
 
 #if !defined(_SSIZE_T_) && !defined(_SSIZE_T_DEFINED)