[CMAKE] Fix host tools build on x86-64 mingw

Dynamically check for sys/types.h and pid_t in wine config.h
Use TARGET_xxx defines instead of _X86_ as this is undefined by GCC
Add some sense in include directories management by using interface
libraries

sdk/include/host/CMakeLists.txt

@@ -0,0 +1,19 @@
+
+include(CheckIncludeFile)
+include(CheckTypeSize)
+
+# check for <sys/types.h>
+CHECK_INCLUDE_FILE("sys/types.h" HAVE_SYS_TYPES_H)
+
+# check for pid_t definition
+if (HAVE_SYS_TYPES_H)
+    set(CMAKE_EXTRA_INCLUDE_FILES "sys/types.h")
+    #this sets HAVE_PID_T
+    CHECK_TYPE_SIZE("pid_t" PID_T)
+    unset(CMAKE_EXTRA_INCLUDE_FILES)
+endif()
+
+configure_file(config.h.in config.h @ONLY)
+
+add_library(host_includes INTERFACE)
+target_include_directories(host_includes INTERFACE ${CMAKE_CURRENT_SOURCE_DIR} ${CMAKE_CURRENT_BINARY_DIR})

sdk/include/host/config.h.in

@@ -3,6 +3,12 @@
 
 #define __WINE_CONFIG_H
 
+/* Define to 1 if you have the <sys/types.h> header file. */
+#cmakedefine HAVE_SYS_TYPES_H @HAVE_SYS_TYPES_H@
+
+/* Define to 1 if the system has the type `pid_t'. */
+#cmakedefine HAVE_PID_T 1
+
 #define HAVE_SPAWNVP 1
 
 /* Define to 1 if you have the `z' library (-lz). */