vs/armv7: use -oldit armasm flag

this quiets warnings from armv6 code [1].
from msdn [2]:
-oldit
Generate ARMv7-style IT blocks. By default, ARMv8-compatible IT blocks
are generated.

a new configuration would be needed for armv8 in any case as the neon
assembly is being built, so removing this should be harmless

[1] A4509: This form of conditional instruction is deprecated
[2] https://msdn.microsoft.com/en-us/library/hh873189.aspx

Change-Id: I4c3b838b52a87401c6daecd83d22ab148ed7c5d9

build/make/gen_msvs_vcxproj.sh

@@ -263,8 +263,8 @@ case "$target" in
     ;;
     arm*)
         platforms[0]="ARM"
-        asm_Debug_cmdline="armasm -nologo "%(FullPath)""
-        asm_Release_cmdline="armasm -nologo "%(FullPath)""
+        asm_Debug_cmdline="armasm -nologo -oldit "%(FullPath)""
+        asm_Release_cmdline="armasm -nologo -oldit "%(FullPath)""
     ;;
     *) die "Unsupported target $target!"
     ;;