Revert "Enable whole program optimization for builds without PGO, too"

This reverts commit f052e99.

There appear to be link issues with upcoming 19.11 and /LTCG, prefer
wider dependency compatibility.

win32/build/confutils.js

@@ -1229,9 +1229,6 @@ function SAPI(sapiname, file_list, makefiletarget, cflags, obj_dir)
 		}
 
 		ldflags += " /PGD:$(PGOPGD_DIR)\\" + makefiletarget.substring(0, makefiletarget.indexOf(".")) + ".pgd";
-	} else if (PHP_DEBUG != "yes") {
-		ADD_FLAG('CFLAGS_' + SAPI, "/GL");
-		ADD_FLAG('LDFLAGS_' + SAPI, "/LTCG:INCREMENTAL");
 	}
 
 	if (MODE_PHPIZE) {
@@ -1432,9 +1429,6 @@ function EXTENSION(extname, file_list, shared, cflags, dllname, obj_dir)
 			ADD_FLAG('CFLAGS_' + EXT, "/GL /O2");
 
 			ldflags = " /PGD:$(PGOPGD_DIR)\\" + dllname.substring(0, dllname.indexOf(".")) + ".pgd";
-		} else if (PHP_DEBUG != "yes") {
-			ADD_FLAG('CFLAGS_' + EXT, "/GL");
-			ADD_FLAG('LDFLAGS_' + EXT, "/LTCG:INCREMENTAL");
 		}
 
 		MFO.WriteLine("$(BUILD_DIR)\\" + libname + ": $(BUILD_DIR)\\" + dllname);
@@ -1477,9 +1471,6 @@ function EXTENSION(extname, file_list, shared, cflags, dllname, obj_dir)
 				ADD_FLAG("STATIC_EXT_CFLAGS", "/GL /O2");
 				static_pgo_enabled = true;
 			}
-		} else if (PHP_DEBUG != "yes") {
-			ADD_FLAG("STATIC_EXT_CFLAGS", "/GL");
-			ADD_FLAG('STATIC_EXT_LDFLAGS', "/LTCG:INCREMENTAL");
 		}
 
 		/* find the header that declares the module pointer,