docs: Mention that libraries for MSVC can be built with a cross compiler

Signed-off-by: Martin Storsjö <martin@martin.st>

doc/general.texi

@@ -934,6 +934,9 @@ make install
 Your install path (@file{/usr/local/} by default) should now have the
 necessary DLL and LIB files under the @file{bin} directory.
 
+Alternatively, build the libraries with a cross compiler, according to
+the instructions below in @ref{Cross compilation for Windows with Linux}.
+
 To use those files with MSVC++, do the same as you would do with
 the static libraries, as described above. But in Step 4,
 you should only need to add the directory where the LIB files are installed
@@ -967,6 +970,7 @@ required when using import libraries generated by lib.exe.
 This issue is reported upstream at
 @url{http://sourceware.org/bugzilla/show_bug.cgi?id=12633}.
 
+@anchor{Cross compilation for Windows with Linux}
 @subsection Cross compilation for Windows with Linux
 
 You must use the MinGW cross compilation tools available at