[Xcode] Make-based builds unnecessarily override PATH

https://bugs.webkit.org/show_bug.cgi?id=265609
rdar://16466196

Reviewed by Alexey Proskuryakov.

Since https://commits.webkit.org/164487@main, we pass
UseSanitizedBuildSystemEnvironment=YES to Xcode, which causes it to use
a well-defined PATH. Additionally, rdar://16466196 made Xcode more
resilient to rebuilds where the PATH changes.

Remove the override.

* Makefile.shared:

Canonical link: https://commits.webkit.org/271362@main

Makefile.shared

@@ -131,11 +131,6 @@ endif
 
 export DSYMUTIL_NUM_THREADS = $(shell sysctl -n hw.activecpu)
 
-# Run xcodebuild with the same PATH with which the Xcode IDE runs, to mitigate unnecessary rebuilds due to PATH differences.
-# See <rdar://problem/16466196>.
-export PATH = $(shell getconf PATH)
-
-
 define set_webkit_configuration
 	$(SCRIPTS_PATH)/set-webkit-configuration $1 $(CONFIG_OPTIONS)
 endef