generate.bat: Remove strcase.[ch] from curl tool VS projects

..because they're no longer needed in the tool build. strcase is still
built by the libcurl project and exports curl_str(n)equal which is used
by the curl tool.

Bug: curl@9363f1a#all_commit_comments

projects/generate.bat

@@ -264,14 +264,12 @@ rem
       for /f "delims=" %%r in ('dir /b ..\src\*.rc') do call :element %1 src "%%r" %3
     ) else if "!var!" == "CURL_SRC_X_C_FILES" (
       call :element %1 lib "strtoofft.c" %3
-      call :element %1 lib "strcase.c" %3
       call :element %1 lib "nonblock.c" %3
       call :element %1 lib "warnless.c" %3
     ) else if "!var!" == "CURL_SRC_X_H_FILES" (
       call :element %1 lib "config-win32.h" %3
       call :element %1 lib "curl_setup.h" %3
       call :element %1 lib "strtoofft.h" %3
-      call :element %1 lib "strcase.h" %3
       call :element %1 lib "nonblock.h" %3
       call :element %1 lib "warnless.h" %3
     ) else if "!var!" == "CURL_LIB_C_FILES" (