FindTCL: Add support for version 8.7

Fixes: #18186

Modules/FindTCL.cmake

@@ -85,6 +85,8 @@ set(TCLTK_POSSIBLE_LIB_PATHS
 )
 
 set(TCLTK_POSSIBLE_LIB_PATH_SUFFIXES
+  lib/tcl/tcl8.7
+  lib/tcl/tk8.7
   lib/tcl/tcl8.6
   lib/tcl/tk8.6
   lib/tcl/tcl8.5
@@ -116,6 +118,7 @@ find_library(TCL_LIBRARY
   NAMES
   tcl
   tcl${TCL_LIBRARY_VERSION} tcl${TCL_TCLSH_VERSION} tcl${TK_WISH_VERSION}
+  tcl87 tcl8.7 tcl87t tcl8.7t
   tcl86 tcl8.6 tcl86t tcl8.6t
   tcl85 tcl8.5
   tcl84 tcl8.4
@@ -130,6 +133,7 @@ find_library(TK_LIBRARY
   NAMES
   tk
   tk${TK_LIBRARY_VERSION} tk${TCL_TCLSH_VERSION} tk${TK_WISH_VERSION}
+  tk87 tk8.7 tk87t tk8.7t
   tk86 tk8.6 tk86t tk8.6t
   tk85 tk8.5
   tk84 tk8.4
@@ -176,6 +180,8 @@ set(TCLTK_POSSIBLE_INCLUDE_PATHS
 set(TCLTK_POSSIBLE_INCLUDE_PATH_SUFFIXES
   include/tcl${TK_LIBRARY_VERSION}
   include/tcl${TCL_LIBRARY_VERSION}
+  include/tcl8.7
+  include/tk8.7
   include/tcl8.6
   include/tk8.6
   include/tcl8.5

Modules/FindTclStub.cmake

@@ -101,6 +101,7 @@ find_library(TCL_STUB_LIBRARY
   NAMES
   tclstub
   tclstub${TK_LIBRARY_VERSION} tclstub${TCL_TCLSH_VERSION} tclstub${TK_WISH_VERSION}
+  tclstub87 tclstub8.7
   tclstub86 tclstub8.6
   tclstub85 tclstub8.5
   tclstub84 tclstub8.4
@@ -114,6 +115,7 @@ find_library(TK_STUB_LIBRARY
   NAMES
   tkstub
   tkstub${TCL_LIBRARY_VERSION} tkstub${TCL_TCLSH_VERSION} tkstub${TK_WISH_VERSION}
+  tkstub87 tkstub8.7
   tkstub86 tkstub8.6
   tkstub85 tkstub8.5
   tkstub84 tkstub8.4

Modules/FindTclsh.cmake

@@ -68,6 +68,7 @@ endif()
 set(TCL_TCLSH_NAMES
   tclsh
   tclsh${TCL_LIBRARY_VERSION} tclsh${TK_LIBRARY_VERSION} tclsh${TK_WISH_VERSION}
+  tclsh87 tclsh8.7
   tclsh86 tclsh8.6
   tclsh85 tclsh8.5
   tclsh84 tclsh8.4