Change usecxx11 to use_cxx11_abi for correspondence with _GLIBCXX_USE_CXX11_ABI (similarly to gxx_abi for __GXX_ABI_VERSION).

Author: rwgk

include/pybind11/conduit/pybind11_platform_abi_id.h

@@ -77,10 +77,11 @@
 #    elif defined(__GXX_ABI_VERSION)
 #        if __GXX_ABI_VERSION >= 1002 && __GXX_ABI_VERSION < 2000
 #            if !defined(_GLIBCXX_USE_CXX11_ABI)
-#                error "UNEXPECTED: _GLIBCXX_USE_CXX11_ABI not defined"
+#                error "UNEXPECTED: _GLIBCXX_USE_CXX11_ABI not defined: PLEASE REVISE THIS CODE."
 #            endif
 #            define PYBIND11_BUILD_ABI                                                            \
-                "_gxx_abi_1xxx_usecxx11_" PYBIND11_PLATFORM_ABI_ID_TOSTRING(_GLIBCXX_USE_CXX11_ABI)
+                "_gxx_abi_1xxx_use_cxx11_abi_" PYBIND11_PLATFORM_ABI_ID_TOSTRING(                 \
+                    _GLIBCXX_USE_CXX11_ABI)
 #        else
 #            error "Unknown platform or compiler (__GXX_ABI_VERSION): PLEASE REVISE THIS CODE."
 #        endif