liblzma: Added a missing config check for _Bool

This fixes a current build problem for liblzma on Solaris 10, SPARC,
and the Solaris Studio compiler.

Utilities/cmliblzma/CMakeLists.txt

@@ -26,11 +26,15 @@ CHECK_INCLUDE_FILE(byteswap.h HAVE_BYTESWAP_H)
 CHECK_INCLUDE_FILE(inttypes.h HAVE_INTTYPES_H)
 CHECK_INCLUDE_FILE(limits.h HAVE_LIMITS_H)
 CHECK_INCLUDE_FILE(memory.h HAVE_MEMORY_H)
-CHECK_INCLUDE_FILE(stdbool.h HAVE_STDBOOL_H)
 CHECK_INCLUDE_FILE(strings.h HAVE_STRINGS_H)
 CHECK_INCLUDE_FILE(string.h HAVE_STRING_H)
 CHECK_INCLUDE_FILE(sys/sysctl.h HAVE_SYS_SYSCTL_H)
 
+CHECK_INCLUDE_FILE(stdbool.h HAVE_STDBOOL_H)
+if(NOT HAVE_STDBOOL_H)
+  CHECK_TYPE_SIZE(_Bool _BOOL)
+endif()
+
 CHECK_C_SOURCE_COMPILES (
   "#include<byteswap.h>\nint main(void){bswap_16(0);return 0;}"
   HAVE_BSWAP_16)