ext/fileinfo: patch out strcasestr() entirely

Instead of disabling the strcasestr() prototype in libmagic/file.h
with -DHAVE_STRCASESTR=1, patch that hunk out to achieve parity on
Windows:

  * Remove the HAVE_STRCASESTR conditional in libmagic/file.h
  * Don't define HAVE_STRCASESTR=1 in the Unix build
  * Remove strcasestr.c from the list of sources in config.w32
  * Regenerate libmagic.patch

This retains the bundled copy of strcasestr.c, but so long as no one
adds it to the list of sources, it will not be used. If we were to
delete it and regenerate the patch, all of the deleted lines would
end up in the repository anyway.

Author: orlitzky

ext/fileinfo/config.m4

@@ -34,7 +34,7 @@ if test "$PHP_FILEINFO" != "no"; then
   PHP_NEW_EXTENSION([fileinfo],
     [fileinfo.c php_libmagic.c $libmagic_sources],
     [$ext_shared],,
-    [-I@ext_srcdir@/libmagic -DHAVE_STRCASESTR=1])
+    [-I@ext_srcdir@/libmagic])
   PHP_ADD_BUILD_DIR([$ext_builddir/libmagic])
   PHP_ADD_EXTENSION_DEP(fileinfo, pcre)
 

ext/fileinfo/config.w32

@@ -8,7 +8,7 @@ if (PHP_FILEINFO != 'no') {
 			encoding.c fsmagic.c funcs.c \
 			is_json.c is_tar.c is_simh.c magic.c print.c \
 			readcdf.c softmagic.c der.c \
-			strcasestr.c buffer.c is_csv.c";
+			buffer.c is_csv.c";
 
 	EXTENSION('fileinfo', 'fileinfo.c php_libmagic.c', true, "/I" + configure_module_dirname + "/libmagic /I" + configure_module_dirname);
 	ADD_EXTENSION_DEP('fileinfo', 'pcre');

ext/fileinfo/libmagic.patch

@@ -1,6 +1,6 @@
 diff -u libmagic.orig/apprentice.c libmagic/apprentice.c
 --- libmagic.orig/apprentice.c	2024-11-27 10:37:00.000000000 -0500
-+++ libmagic/apprentice.c	2026-03-20 12:02:11.209343516 -0400
++++ libmagic/apprentice.c	2026-03-20 12:10:19.777614667 -0400
 @@ -32,7 +32,7 @@
  #include "file.h"
 
@@ -1440,7 +1440,7 @@ diff -u libmagic.orig/cdf.h libmagic/cdf.h
 
 diff -u libmagic.orig/compress.c libmagic/compress.c
 --- libmagic.orig/compress.c	2024-11-10 11:52:27.000000000 -0500
-+++ libmagic/compress.c	2026-03-20 12:02:11.209343516 -0400
++++ libmagic/compress.c	2026-03-20 12:10:19.777614667 -0400
 @@ -64,13 +64,14 @@
  #if defined(HAVE_SYS_TIME_H)
  #include <sys/time.h>
@@ -1727,7 +1727,7 @@ diff -u libmagic.orig/encoding.c libmagic/encoding.c
  }
 diff -u libmagic.orig/file.h libmagic/file.h
 --- libmagic.orig/file.h	2024-11-27 10:37:00.000000000 -0500
-+++ libmagic/file.h	2026-03-20 12:03:18.205380698 -0400
++++ libmagic/file.h	2026-03-20 15:39:51.133617915 -0400
 @@ -27,15 +27,13 @@
   */
  /*
@@ -1898,7 +1898,7 @@ diff -u libmagic.orig/file.h libmagic/file.h
  typedef struct {
  	char *buf;
  	size_t blen;
-@@ -649,19 +629,6 @@
+@@ -649,28 +629,12 @@
  extern file_protected const size_t file_nnames;
  #endif
 
@@ -1918,7 +1918,16 @@ diff -u libmagic.orig/file.h libmagic/file.h
  #ifndef HAVE_STRLCPY
  size_t strlcpy(char *, const char *, size_t);
  #endif
-@@ -681,31 +648,6 @@
+ #ifndef HAVE_STRLCAT
+ size_t strlcat(char *, const char *, size_t);
+ #endif
+-#ifndef HAVE_STRCASESTR
+-char *strcasestr(const char *, const char *);
+-#endif
+ #ifndef HAVE_GETLINE
+ ssize_t getline(char **, size_t *, FILE *);
+ ssize_t getdelim(char **, size_t *, int, FILE *);
+@@ -681,31 +645,6 @@
  #ifndef HAVE_ASCTIME_R
  char   *asctime_r(const struct tm *, char *);
  #endif
@@ -2608,7 +2617,7 @@ diff -u libmagic.orig/funcs.c libmagic/funcs.c
  file_clear_closexec(int fd) {
 diff -u libmagic.orig/magic.c libmagic/magic.c
 --- libmagic.orig/magic.c	2024-06-19 12:18:53.000000000 -0400
-+++ libmagic/magic.c	2026-03-20 12:02:11.209343516 -0400
++++ libmagic/magic.c	2026-03-20 12:10:19.777614667 -0400
 @@ -25,11 +25,6 @@
   * SUCH DAMAGE.
   */
@@ -3081,8 +3090,8 @@ diff -u libmagic.orig/magic.c libmagic/magic.c
  	}
  	return file_getbuffer(ms);
 diff -u libmagic.orig/magic.h libmagic/magic.h
---- libmagic.orig/magic.h	2026-03-20 12:07:07.493507951 -0400
-+++ libmagic/magic.h	2026-03-20 12:02:11.209343516 -0400
+--- libmagic.orig/magic.h	2026-03-20 15:48:25.885903599 -0400
++++ libmagic/magic.h	2026-03-20 12:10:19.777614667 -0400
 @@ -47,8 +47,6 @@
  					   * extensions */
  #define MAGIC_COMPRESS_TRANSP	0x2000000 /* Check inside compressed files

ext/fileinfo/libmagic/file.h

@@ -635,9 +635,6 @@ size_t strlcpy(char *, const char *, size_t);
 #ifndef HAVE_STRLCAT
 size_t strlcat(char *, const char *, size_t);
 #endif
-#ifndef HAVE_STRCASESTR
-char *strcasestr(const char *, const char *);
-#endif
 #ifndef HAVE_GETLINE
 ssize_t getline(char **, size_t *, FILE *);
 ssize_t getdelim(char **, size_t *, int, FILE *);