[gtkmm/gtkmm-3-24] NMake Makefiles: Standardize on PDB version

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

commit ab50306ee98ce7d6b5f1aed4414cea324f0e0bf7
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Sun Apr 5 11:29:30 2020 +0800

    NMake Makefiles: Standardize on PDB version
    
    Make the default prefix relate to the PDB version, not the Visual Studio
    version.  This is becuase the dependent C++-11 -mm libraries already did
    so.

 MSVC_NMake/detectenv-msvc.mak | 2 +-
 MSVC_NMake/info-msvc.mak      | 5 +++--
 2 files changed, 4 insertions(+), 3 deletions(-)
---
diff --git a/MSVC_NMake/detectenv-msvc.mak b/MSVC_NMake/detectenv-msvc.mak
index 9a92c110..634fe684 100644
--- a/MSVC_NMake/detectenv-msvc.mak
+++ b/MSVC_NMake/detectenv-msvc.mak
@@ -8,7 +8,7 @@
 # in $(GLIB_PREFIX)\lib.
 
 !if "$(PREFIX)" == ""
-PREFIX = ..\..\vs$(VSVER)\$(PLAT)
+PREFIX = ..\..\vs$(PDBVER)\$(PLAT)
 !endif
 
 # Location of the PERL interpreter, for running glib-mkenums.  glib-mkenums
diff --git a/MSVC_NMake/info-msvc.mak b/MSVC_NMake/info-msvc.mak
index 34d8bbce..3e7b7813 100644
--- a/MSVC_NMake/info-msvc.mak
+++ b/MSVC_NMake/info-msvc.mak
@@ -22,8 +22,9 @@ help:
        @echo.
        @echo PREFIX: Optional, the path where dependent libraries and tools may be
        @echo found, default is ^$(srcrootdir)\..\vs^$(short_vs_ver)\^$(platform),
-       @echo where ^$(short_vs_ver) is 15 for VS 2017 and so on; and
-       @echo ^$(platform) is Win32 for 32-bit builds and x64 for x64 builds.
+       @echo where ^$(short_vs_ver) is 12 for VS 2013, and 14 for VS 2015~2019
+       @echo and so on; and ^$(platform) is Win32 for 32-bit builds and x64 for
+       @echo x64 builds.
        @echo.
        @echo ------
        @echo Possible options include the following: