patch 8.1.1306: Borland support is outdated and doesn't work

Problem:    Borland support is outdated and doesn't work.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)

src/GvimExt/Make_bc5.mak

@@ -1,43 +0,0 @@
-### USEDLL  no for statically linked version of run-time, yes for DLL runtime
-### BOR	    path to root of Borland C install (c:\bc5)
-
-### (requires cc3250.dll be available in %PATH%)
-!if ("$(USEDLL)"=="")
-USEDLL = no
-!endif
-
-### BOR: root of the BC installation
-!if ("$(BOR)"=="")
-BOR = c:\bc5
-!endif
-
-CC	= $(BOR)\bin\Bcc32
-BRC	= $(BOR)\bin\brc32
-LINK	= $(BOR)\BIN\ILink32
-INCLUDE = $(BOR)\include;.
-LIB	= $(BOR)\lib
-
-!if ("$(USEDLL)"=="yes")
-RT_DEF = -D_RTLDLL
-RT_LIB = cw32i.lib
-!else
-RT_DEF =
-RT_LIB = cw32.lib
-!endif
-
-
-all : gvimext.dll
-
-gvimext.obj : gvimext.cpp gvimext.h
-	$(CC) -tWD -I$(INCLUDE) -c -DFEAT_GETTEXT $(RT_DEF) -w- gvimext.cpp
-
-gvimext.res : gvimext.rc
-	$(BRC) -r gvimext.rc
-
-gvimext.dll : gvimext.obj gvimext.res
-	$(LINK) -L$(LIB) -aa gvimext.obj, gvimext.dll, , c0d32.obj $(RT_LIB) import32.lib, gvimext.def, gvimext.res
-
-clean :
-	-@del gvimext.obj
-	-@del gvimext.res
-	-@del gvimext.dll

src/GvimExt/gvimext.cpp

@@ -16,14 +16,7 @@
 
 #include "gvimext.h"
 
-#ifdef __BORLANDC__
-# include <dir.h>
-# ifndef _strnicmp
-#  define _strnicmp(a, b, c) strnicmp((a), (b), (c))
-# endif
-#else
 static char *searchpath(char *name);
-#endif
 
 // Always get an error while putting the following stuff to the
 // gvimext.h file as class protected variables, give up and
@@ -917,7 +910,6 @@ BOOL CShellExt::LoadMenuIcon()
 	return TRUE;
 }
 
-#ifndef __BORLANDC__
     static char *
 searchpath(char *name)
 {
@@ -937,7 +929,6 @@ searchpath(char *name)
     }
     return (char *)"";
 }
-#endif
 
 STDMETHODIMP CShellExt::InvokeGvim(HWND hParent,
 				   LPCSTR  /* pszWorkingDir */,

src/GvimExt/gvimext.rc

@@ -7,9 +7,7 @@
 //
 // Generated from the TEXTINCLUDE 2 resource.
 //
-#ifndef __BORLANDC__
-# include "winresrc.h"
-#endif
+#include "winresrc.h"
 
 /////////////////////////////////////////////////////////////////////////////
 #undef APSTUDIO_READONLY_SYMBOLS