silence -Wparentheses-equality

Clang has taken it upon itself to warn when an equality is wrapped in
double parentheses, e.g.

    ((foo == bar))

Which is a bit dumb, as any code along the lines of

    #define isBAR (foo == BAR)
    if (isBAR) {}

will trigger the warning.

This commit shuts clang up by putting in a harmless cast:

    #define isBAR cBOOL(foo == BAR)

1 files changed, 1 insertions, 1 deletions

diff --git a/perl.h b/perl.h
index 2ee79c4262..0468a1c53a 100644
--- a/perl.h
+++ b/perl.h
@@ -5275,7 +5275,7 @@ EXTCONST char *const PL_phase_names[];
 /* Do not use this macro. It only exists for extensions that rely on PL_dirty
  * instead of using the newer PL_phase, which provides everything PL_dirty
  * provided, and more. */
-#  define PL_dirty (PL_phase == PERL_PHASE_DESTRUCT)
+#  define PL_dirty cBOOL(PL_phase == PERL_PHASE_DESTRUCT)
 
 #  define PL_amagic_generation PL_na
 #endif /* !PERL_CORE */