patch 8.1.1306: Borland support is outdated and doesn't work

Problem:    Borland support is outdated and doesn't work.
Solution:   Remove Borland support, there are other (free) compilers
            available. (Thomas Dziedzic, Ken Takata, closes #4364)
diff --git a/runtime/doc/debug.txt b/runtime/doc/debug.txt
index 37a5772..4564565 100644
--- a/runtime/doc/debug.txt
+++ b/runtime/doc/debug.txt
@@ -80,9 +80,8 @@
 
 If you have Visual Studio, use that instead of the VC Toolkit and WinDbg.
 
-For other compilers, you should always use the corresponding debugger: TD for
-a Vim executable compiled with the Borland compiler; gdb (see above
-|debug-gcc|) for the Cygwin and MinGW compilers.
+For other compilers, you should always use the corresponding debugger: gdb
+(see above |debug-gcc|) for the Cygwin and MinGW compilers.
 
 
 								*debug-vs2005*
diff --git a/runtime/doc/develop.txt b/runtime/doc/develop.txt
index 2d0cc22..9c7867c 100644
--- a/runtime/doc/develop.txt
+++ b/runtime/doc/develop.txt
@@ -278,7 +278,6 @@
 index		shadows global declaration
 time		shadows global declaration
 new		C++ reserved keyword
-try		Borland C++ doesn't like it to be used as a variable.
 
 clear		Mac curses.h
 echo		Mac curses.h
diff --git a/runtime/doc/usr_90.txt b/runtime/doc/usr_90.txt
index a5b4292..087de8f 100644
--- a/runtime/doc/usr_90.txt
+++ b/runtime/doc/usr_90.txt
@@ -281,9 +281,8 @@
 In case you are not satisfied with the features included in the supplied
 binaries, you could try compiling Vim yourself.  Get the source archive from
 the same location as where the binaries are.  You need a compiler for which a
-makefile exists.  Microsoft Visual C works, but is expensive.  The Free
-Borland command-line compiler 5.5 can be used, as well as the free MingW and
-Cygwin compilers.  Check the file src/INSTALLpc.txt for hints.
+makefile exists.  Microsoft Visual C works, but is expensive.  The free MinGW
+and Cygwin compilers can be used.  Check the file src/INSTALLpc.txt for hints.
 
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 *90.3*	Upgrading