Replace invalid code with a proper #error

This code creates a nasty error as mentioned in bugs #31131, #37062
Patch taken from Debian's PHP package: 044-strtod_arm_fix

Author: kaplanlior

NEWS

@@ -4,6 +4,7 @@ PHP                                                                        NEWS
 
 - Core:
   . Added validation of class names in the autoload process. (Dmitry)
+  . Fixed invalid C code in zend_strtod.c. (Lior Kaplan)
   . Fixed bug #61645 (fopen and O_NONBLOCK). (Mike)
 
 - Date:

Zend/zend_strtod.c

@@ -267,8 +267,7 @@ BEGIN_EXTERN_C()
 
 #if defined(IEEE_LITTLE_ENDIAN) + defined(IEEE_BIG_ENDIAN) + defined(VAX) + \
 		    defined(IBM) != 1
-	Exactly one of IEEE_LITTLE_ENDIAN IEEE_BIG_ENDIAN, VAX, or
-	IBM should be defined.
+#error "Exactly one of IEEE_LITTLE_ENDIAN IEEE_BIG_ENDIAN, VAX, or IBM should be defined."
 #endif
 
 	typedef union {