Revert "Add RPATH to shared libraries"

This reverts commit 3b3db143.

Reason for revert: Strongest suspect for the last 40 failures of telemetry_perf_unittests and telemetry_unittests which failed being unable to find some shared libraries.

Bug:913070

Original change's description:
> Add RPATH to shared libraries
> 
> Fixes libfontconfig.so not being able to find libfreetype_harfbuzz.so:
> 
> $ ldd libfontconfig.so | grep freetype_harfbuzz
> 	libfreetype_harfbuzz.so => not found
> $ ls libfreetype_harfbuzz.so
> libfreetype_harfbuzz.so
> 
> R=​thakis
> 
> Bug: 911836,912366
> Change-Id: Ia0aaed8fc2c745b02cecf9ee3ce9888c1d8ccf77
> Reviewed-on: https://chromium-review.googlesource.com/c/1362457
> Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
> Reviewed-by: Dirk Pranke <dpranke@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#614255}

TBR=thakis@chromium.org,dpranke@chromium.org,thomasanderson@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 911836, 912366
Change-Id: Ief4c7258208a2903bb06685d4edc76f482f7a0bf
Reviewed-on: https://chromium-review.googlesource.com/c/1371385Reviewed-by: Friedrich Horschig [CET] <fhorschig@chromium.org>
Commit-Queue: Friedrich Horschig [CET] <fhorschig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#615492}

build/config/BUILD.gn

@@ -385,8 +385,6 @@ config("shared_library_config") {
     configs += [ "//build/config/ios:ios_dynamic_flags" ]
   } else if (is_chromecast) {
     configs += [ "//build/config/chromecast:shared_library_config" ]
-  } else if (is_linux || current_os == "aix") {
-    configs += [ "//build/config/gcc:shared_library_config" ]
   }
 
   # If we're using the prebuilt instrumented libraries with the sanitizers, we

build/config/gcc/BUILD.gn

@@ -84,24 +84,20 @@ config("rpath_for_built_shared_libraries") {
   }
 }
 
-if (is_component_build && !is_android) {
-  # See the rpath_for... config above for why this is necessary for component
-  # builds.
-  executable_and_shared_library_configs_ =
-      [ ":rpath_for_built_shared_libraries" ]
-} else {
-  executable_and_shared_library_configs_ = []
-}
-
 # Settings for executables.
 config("executable_config") {
-  configs = executable_and_shared_library_configs_
   ldflags = [ "-pie" ]
   if (is_android) {
     ldflags += [
       "-Bdynamic",
       "-Wl,-z,nocopyreloc",
     ]
+  } else {
+    # See the rpath_for... config above for why this is necessary for component
+    # builds.
+    if (is_component_build) {
+      configs = [ ":rpath_for_built_shared_libraries" ]
+    }
   }
 
   if (!is_android && current_os != "aix") {
@@ -120,8 +116,3 @@ config("executable_config") {
     ]
   }
 }
-
-# Settings for shared libraries.
-config("shared_library_config") {
-  configs = executable_and_shared_library_configs_
-}