Remove check for time.h and HAVE_TIME_H (#11726)

The `<time.h>` header file is part of the standard C89 headers [1] and
on current systems can be included unconditionally.

The conditional include based on Windows is there so the win32/time.h
can be included on other places when needed.

Refs:
[1] https://port70.net/~nsz/c/c89/c89-draft.html#4.1.2
[2] https://git.savannah.gnu.org/cgit/autoconf.git/tree/lib/autoconf/headers.m4

Author: petk

Zend/zend_hrtime.h

@@ -24,7 +24,7 @@
 #ifdef HAVE_UNISTD_H
 # include <unistd.h>
 #endif
-#ifdef HAVE_TIME_H
+#ifndef PHP_WIN32
 # include <time.h>
 #endif
 

configure.ac

@@ -398,7 +398,6 @@ dirent.h \
 sys/param.h \
 sys/types.h \
 sys/time.h \
-time.h \
 netinet/in.h \
 alloca.h \
 arpa/inet.h \