Fix #79884: PHP_CONFIG_FILE_PATH is meaningless

It does not make sense to make assumptions about `PHP_CONFIG_FILE_PATH`
during build time, since that value is never used during run time on
Windows.  Since there is no `--with-config-file-path` on Windows
either, we define `PHP_CONFIG_FILE_PATH` as `""`.

Author: cmb69

NEWS

@@ -2,6 +2,9 @@ PHP                                                                        NEWS
 |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
 ?? ??? ????, PHP 7.3.22
 
+- Core:
+  . Fixed bug #79884 (PHP_CONFIG_FILE_PATH is meaningless). (cmb)
+
 ?? ??? ????, PHP 7.3.21
 
 - Apache:

win32/build/config.w32.h.in

@@ -9,7 +9,7 @@
 #define NTDDI_VERSION 0x06010000
 
 /* Default PHP / PEAR directories */
-#define PHP_CONFIG_FILE_PATH (getenv("SystemRoot")?getenv("SystemRoot"):"")
+#define PHP_CONFIG_FILE_PATH ""
 #define CONFIGURATION_FILE_PATH "php.ini"
 #define PEAR_INSTALLDIR "@PREFIX@\\pear"
 #define PHP_BINDIR "@PREFIX@"