Fix ZTS OPcache build on Cygwin

`configure --enable-opcache --disable-opcache-jit --enable-zts` won't
compile on Cygwin.  We fix this, but that does not imply that OPcache
properly works in this environment, let alone that JIT would be
functional.

Closes GH-16920.

NEWS

@@ -20,6 +20,9 @@ PHP                                                                        NEWS
 - Intl:
   . Bumped ICU requirement to ICU >= 57.1. (cmb)
 
+- OPcache:
+  . Fixed ZTS OPcache build on Cygwin. (cmb)
+
 - Output:
   . Fixed calculation of aligned buffer size. (cmb)
 

TSRM/TSRM.c

@@ -778,15 +778,15 @@ TSRM_API size_t tsrm_get_ls_cache_tcb_offset(void)
 	return 0;
 #elif defined(__x86_64__) && defined(__GNUC__) && !defined(__FreeBSD__) && \
 	!defined(__NetBSD__) && !defined(__OpenBSD__) && !defined(__MUSL__) && \
-	!defined(__HAIKU__)
+	!defined(__HAIKU__) && !defined(__CYGWIN__)
 	size_t ret;
 
 	asm ("movq _tsrm_ls_cache@gottpoff(%%rip),%0"
           : "=r" (ret));
 	return ret;
 #elif defined(__i386__) && defined(__GNUC__) && !defined(__FreeBSD__) && \
 	!defined(__NetBSD__) && !defined(__OpenBSD__) && !defined(__MUSL__) && \
-	!defined(__HAIKU__)
+	!defined(__HAIKU__) && !defined(__CYGWIN__)
 	size_t ret;
 
 	asm ("leal _tsrm_ls_cache@ntpoff,%0"