Persist STRICT_APPLE_COMPATIBILITY in config.h

On Windows, the value of `STRICT_APPLE_COMPATIBILITY` determines whether `BOOL` is a char or an int.  This value must be consistent across all libraries that use libobjc2.  Rather than requiring all libraries to explicitly define `STRICT_APPLE_COMPATIBILITY`, persist the value of `STRICT_APPLE_COMPATIBILITY` in `objc-config.h` and include that in `runtime.h`.

CMakeLists.txt

@@ -99,7 +99,8 @@ set(libobjc_HDRS
 	objc/objc.h
 	objc/runtime-deprecated.h
 	objc/runtime.h
-	objc/slot.h)
+	objc/slot.h
+	${PROJECT_BINARY_DIR}/objc/objc-config.h)
 
 set(libobjc_CXX_SRCS
 	selector_table.cc
@@ -150,6 +151,9 @@ add_compile_definitions($<$<BOOL:${ENABLE_TRACING}>:WITH_TRACING=1>)
 add_compile_definitions($<$<BOOL:${DEBUG_ARC_COMPAT}>:DEBUG_ARC_COMPAT>)
 add_compile_definitions($<$<BOOL:${STRICT_APPLE_COMPATIBILITY}>:STRICT_APPLE_COMPATIBILITY>)
 
+configure_file(objc/objc-config.h.in objc/objc-config.h @ONLY)
+include_directories("${PROJECT_BINARY_DIR}/objc/")
+
 if (OLDABI_COMPAT)
 	list(APPEND libobjc_C_SRCS legacy.c abi_version.c statics_loader.c)
 	add_definitions(-DOLDABI_COMPAT=1)

objc/objc-config.h.in

@@ -0,0 +1 @@
+#cmakedefine STRICT_APPLE_COMPATIBILITY @STRICT_APPLE_COMPATIBILITY@

objc/runtime.h

@@ -2,6 +2,7 @@
 #pragma clang system_header
 #endif
 #include "objc-visibility.h"
+#include "objc-config.h"
 
 #ifndef __LIBOBJC_RUNTIME_H_INCLUDED__
 #define __LIBOBJC_RUNTIME_H_INCLUDED__