gnutls, vmime: remove unnecessary explicit WINVER

src/gnutls.mk

@@ -31,7 +31,6 @@ define $(PKG)_BUILD
         --with-libregex-libs="-lgnurx" \
         --without-p11-kit \
         --disable-silent-rules \
-        CPPFLAGS='-DWINVER=0x0501' \
         LIBS='-lws2_32' \
         ac_cv_prog_AR='$(TARGET)-ar'
     $(MAKE) -C '$(1)' -j '$(JOBS)' install

src/vmime.mk

@@ -18,7 +18,6 @@ define $(PKG)_BUILD
         -DCMAKE_RANLIB='$(PREFIX)/bin/$(TARGET)-ranlib' \
         -DVMIME_HAVE_MESSAGING_PROTO_SENDMAIL=False \
         -DVMIME_HAVE_MLANG_H=False \
-        -DCMAKE_CXX_FLAGS='-DWINVER=0x0501' \
         -DVMIME_BUILD_STATIC_LIBRARY=$(CMAKE_STATIC_BOOL) \
         -DVMIME_BUILD_SHARED_LIBRARY=$(CMAKE_SHARED_BOOL) \
         -DVMIME_BUILD_SAMPLES=OFF \