drop 1238661 patch, no longer applies, patched file not shipped anymore

Bug-1238661---fix-mozillaSignalTrampoline-to-work-.patch

@@ -1,15 +0,0 @@
-diff -up firefox-68.0/mfbt/LinuxSignal.h.1238661 firefox-68.0/mfbt/LinuxSignal.h
---- firefox-68.0/mfbt/LinuxSignal.h.1238661	2019-07-08 22:27:29.620749569 +0200
-+++ firefox-68.0/mfbt/LinuxSignal.h	2019-07-08 22:44:17.794112428 +0200
-@@ -22,7 +22,10 @@ __attribute__((naked)) void SignalTrampo
-                                              void* aContext) {
-   asm volatile("nop; nop; nop; nop" : : : "memory");
- 
--  asm volatile("b %0" : : "X"(H) : "memory");
-+  // Because the assembler may generate additional insturctions below, we
-+  // need to ensure NOPs are inserted first by separating them out above.
-+
-+  asm volatile("bx %0" : : "r"(H), "l"(aSignal), "l"(aInfo), "l"(aContext) : "memory");
- }
- 
- #  define MOZ_SIGNAL_TRAMPOLINE(h) (mozilla::SignalTrampoline<h>)

firefox.spec

@@ -177,7 +177,6 @@ Patch227:        firefox-locale-debug.patch
 # Upstream patches
 Patch402:        mozilla-1196777.patch
 Patch412:        mozilla-1337988.patch
-Patch415:        Bug-1238661---fix-mozillaSignalTrampoline-to-work-.patch
 Patch417:        bug1375074-save-restore-x28.patch
 Patch422:        mozilla-1580174-webrtc-popup.patch
 
@@ -382,9 +381,6 @@ This package contains results of tests executed during build.
 %patch227 -p1 -b .locale-debug
 
 %patch402 -p1 -b .1196777
-%ifarch %{arm}
-%patch415 -p1 -b .1238661
-%endif
 
 
 # Wayland specific upstream patches