Move VS2010 Git ignore list to the VS2010 directory

The main benefit is that this ensures that the directory always exists in a
Git checkout. This way the maintenance scripts don't have to worry about the
case where the directory doesn't exist.

Also it unclutters `/.gitignore`.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>

.gitignore

@@ -37,18 +37,6 @@ massif-*
 # Microsoft CMake extension for Visual Studio Code generates a build directory by default
 /build/
 
-# Visual Studio automatically generated files
-/visualc/VS2010/mbedTLS.sln
-/visualc/VS2010/*.vcxproj
-
-# Visual Studio artifacts
-/visualc/VS2010/.localhistory/
-/visualc/VS2010/.vs/
-/visualc/VS2010/Debug/
-/visualc/VS2010/Release/
-/visualc/VS2010/*.vcxproj.filters
-/visualc/VS2010/*.vcxproj.user
-
 # Generated documentation:
 /apidoc
 

visualc/VS2010/.gitignore

@@ -0,0 +1,14 @@
+# Files automatically generated by generate_visualc_files.pl
+/mbedTLS.sln
+/*.vcxproj
+
+# Files that may be left over from check-generated-files.sh
+/*.bak
+
+# Visual Studio artifacts
+/.localhistory/
+/.vs/
+/Debug/
+/Release/
+/*.vcxproj.filters
+/*.vcxproj.user