Fixed build on ARMv7

Makefile

@@ -8,6 +8,7 @@ mozjs:
 
 	tar xf firefox-68.11.0esr.source.tar.xz
 	patch -Np1 -d firefox-68.11.0 < firefox-68.11.0-no_rust.patch
+	patch -Np1 -d firefox-68.11.0 < firefox-68.11.0-fix_armv7.patch
 	mkdir -p firefox-68.11.0/obj
 	cd firefox-68.11.0/obj && PATH=/build/usr/bin:$$PATH SHELL=/bin/bash CC=gcc CXX=g++ LLVM_OBJDUMP=/bin/false ../js/src/configure --prefix=/usr --with-intl-api --with-system-zlib --with-system-icu --disable-jemalloc --disable-debug-symbols --enable-readline
 	$(MAKE) -C firefox-68.11.0/obj SHELL=/bin/bash

firefox-68.11.0-fix_armv7.patch

+diff -uNr firefox-68.11.0/js/src/wasm/WasmSignalHandlers.cpp firefox-68.11.0-fix_armv7/js/src/wasm/WasmSignalHandlers.cpp
+--- firefox-68.11.0/js/src/wasm/WasmSignalHandlers.cpp	2020-07-21 06:33:11.000000000 +0930
++++ firefox-68.11.0-fix_armv7/js/src/wasm/WasmSignalHandlers.cpp	2021-08-01 03:18:55.385132240 +0930
+@@ -248,7 +248,16 @@
+ #endif
+ 
+ #ifdef WASM_EMULATE_ARM_UNALIGNED_FP_ACCESS
+-#  include <sys/user.h>
++struct user_vfp {
++  unsigned long long fpregs[32];
++  unsigned long fpscr;
++};
++
++struct user_vfp_exc {
++  unsigned long fpexc;
++  unsigned long fpinst;
++  unsigned long fpinst2;
++};
+ #endif
+ 
+ #if defined(ANDROID)