Fix the zlib-ng failing tests, for real

I failed to properly account for the case in which the two string are
completely equal.

(cherry picked from commit 4b31974)

test cases/linuxlike/1 pkg-config/prog-checkver.c

@@ -4,6 +4,12 @@
 #include <string.h>
 
 static bool check_version(const char *zlib_ver, const char *found_zlib) {
+    if (zlib_ver == found_zlib)
+        return true;
+
+    if (strcmp(zlib_ver, found_zlib) == 0)
+        return true;
+
 #ifdef ZLIBNG_VERSION
     const char *ptr = strstr(zlib_ver, found_zlib);
 
@@ -16,22 +22,19 @@ static bool check_version(const char *zlib_ver, const char *found_zlib) {
      * that FOUND_ZLIB is the start of ZLIB_VERSION, so compare the rest.
      */
     ptr += strlen(found_zlib);
-    if (strcmp(ptr, ".zlib-ng") != 0)
-        return false;
-#else
-    if (strcmp(zlib_ver, found_zlib) != 0)
-        return false;
+    if (strcmp(ptr, ".zlib-ng") == 0)
+        return true;
 #endif
 
-    return true;
+    return false;
 }
 
 int main(void) {
     void * something = deflate;
     if (!check_version(ZLIB_VERSION, FOUND_ZLIB)) {
         printf("Meson found '%s' but zlib is '%s'\n", FOUND_ZLIB, ZLIB_VERSION);
 #ifdef ZLIBNG_VERSION
-        puts("Note that in the case of zlib-ng, a version suffix of .zlib-ng is expected\n");
+        puts("Note that in the case of zlib-ng, a version suffix of .zlib-ng is expected");
 #endif
         return 2;
     }

test cases/linuxlike/13 cmake dependency/prog-checkver.c

@@ -4,6 +4,12 @@
 #include <string.h>
 
 static bool check_version(const char *zlib_ver, const char *found_zlib) {
+    if (zlib_ver == found_zlib)
+        return true;
+
+    if (strcmp(zlib_ver, found_zlib) == 0)
+        return true;
+
 #ifdef ZLIBNG_VERSION
     const char *ptr = strstr(zlib_ver, found_zlib);
 
@@ -16,22 +22,19 @@ static bool check_version(const char *zlib_ver, const char *found_zlib) {
      * that FOUND_ZLIB is the start of ZLIB_VERSION, so compare the rest.
      */
     ptr += strlen(found_zlib);
-    if (strcmp(ptr, ".zlib-ng") != 0)
-        return false;
-#else
-    if (strcmp(zlib_ver, found_zlib) != 0)
-        return false;
+    if (strcmp(ptr, ".zlib-ng") == 0)
+        return true;
 #endif
 
-    return true;
+    return false;
 }
 
 int main(void) {
     void * something = deflate;
     if (!check_version(ZLIB_VERSION, FOUND_ZLIB)) {
         printf("Meson found '%s' but zlib is '%s'\n", FOUND_ZLIB, ZLIB_VERSION);
 #ifdef ZLIBNG_VERSION
-        puts("Note that in the case of zlib-ng, a version suffix of .zlib-ng is expected\n");
+        puts("Note that in the case of zlib-ng, a version suffix of .zlib-ng is expected");
 #endif
         return 2;
     }