external/firebird: Fix -Wincompatible-function-pointer-types

...after Clang 16 trunk
<af01f717c4>
"Default implicit function pointer conversions diagnostic to be an error"

Change-Id: Ibe06a94f45010efdeaf0c05a661f269e7a07d561
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/140095
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

external/firebird/UnpackedTarball_firebird.mk

@@ -50,6 +50,7 @@ $(eval $(call gb_UnpackedTarball_add_patches,firebird,\
     external/firebird/wnt-per-process-trace-storage.patch.1 \
     external/firebird/0001-extern-cloop-Missing-dependencies-of-compilations-on.patch.1 \
     external/firebird/configure-c99.patch \
+    external/firebird/Wincompatible-function-pointer-types.patch \
 ))
 
 ifeq ($(OS),WNT)

external/firebird/Wincompatible-function-pointer-types.patch

@@ -0,0 +1,11 @@
+--- extern/cloop/src/tests/test1/CTest.c
++++ extern/cloop/src/tests/test1/CTest.c
+@@ -402,7 +402,7 @@
+ 	struct CALC_IFactory* (*createFactory)();
+ 
+ #ifdef WIN32
+-	createFactory = (struct Factory* (*)()) GetProcAddress(library, "createFactory");
++	createFactory = (struct CALC_IFactory* (*)()) GetProcAddress(library, "createFactory");
+ #else
+ 	createFactory = dlsym(library, "createFactory");
+ #endif