bpo-35059, PCbuild: Expand inline funcs in Debug (GH-10094)

Visual Studio solution: Set InlineFunctionExpansion to
OnlyExplicitInline ("/Ob1" option) on all projects (in
pyproject.props) in Debug mode on Win32 and x64 platforms to expand
functions marked as inline.

This change should make Python compiled in Debug mode a little bit
faster on Windows. On Unix, GCC uses -Og optimization level for
./configure --with-pydebug.

Misc/NEWS.d/next/Build/2018-10-26-14-49-19.bpo-35059.PKsBxP.rst

+PCbuild: Set InlineFunctionExpansion to OnlyExplicitInline ("/Ob1" option)
+in pyproject.props in Debug mode to expand functions marked as inline. This
+change should make Python compiled in Debug mode a little bit faster on
+Windows.

PCbuild/pyproject.props

@@ -42,6 +42,8 @@
       <SuppressStartupBanner>true</SuppressStartupBanner>
       <WholeProgramOptimization>true</WholeProgramOptimization>
       <EnableEnhancedInstructionSet Condition="'$(Platform)'=='Win32'">NoExtensions</EnableEnhancedInstructionSet>
+      <InlineFunctionExpansion Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">OnlyExplicitInline</InlineFunctionExpansion>
+      <InlineFunctionExpansion Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">OnlyExplicitInline</InlineFunctionExpansion>
     </ClCompile>
     <ClCompile Condition="$(Configuration) == 'Debug'">
       <Optimization>Disabled</Optimization>