Fix build flags for ARMv7.

Taken from Debian:
https://salsa.debian.org/multimedia-team/x265/-/blob/master/debian/patches/0001-Fix-arm-flags.patch

From: Sebastian Ramacher <sramacher@debian.org>
Date: Wed, 26 Apr 2017 22:05:06 +0200
Subject: Fix arm* flags

---
 source/CMakeLists.txt | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/source/CMakeLists.txt b/source/CMakeLists.txt
--- a/source/CMakeLists.txt
+++ b/source/CMakeLists.txt
@@ -77,7 +77,7 @@ elseif(ARMMATCH GREATER "-1")
         add_definitions(-DX265_ARCH_ARM=1 -DX265_ARCH_ARM64=1 -DHAVE_ARMV6=0)
     else()
         message(STATUS "Detected ARM target processor")
-        add_definitions(-DX265_ARCH_ARM=1 -DX265_ARCH_ARM64=0 -DHAVE_ARMV6=1)
+        add_definitions(-DX265_ARCH_ARM=1)
     endif()
 else()
     message(STATUS "CMAKE_SYSTEM_PROCESSOR value `${CMAKE_SYSTEM_PROCESSOR}` is unknown")
@@ -252,10 +252,7 @@ if(GCC)
         else()
             find_package(Neon)
             if(CPU_HAS_NEON)
-                set(ARM_ARGS -mcpu=native -mfloat-abi=hard -mfpu=neon -marm -fPIC)
                 add_definitions(-DHAVE_NEON)
-            else()
-                set(ARM_ARGS -mcpu=native -mfloat-abi=hard -mfpu=vfp -marm)
             endif()
         endif()
     endif()
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<tr><td><span title='2021-03-29 17:18:38 +0300'>2021-03-29</span></td><td><a href='/guix/commit/gnu/packages/perl-check.scm?id=be34826886508a52babd05477d89d39bae6ff454'>gnu: perl-test-output: Update to 1.033.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/perl-check.scm (perl-test-output): Update to 1.033.
</span></span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2021-02-08 13:46:26 +0200'>2021-02-08</span></td><td><a href='/guix/commit/gnu/packages/perl-check.scm?id=b9f9f9a3f4a3efe19fad7c7f15a7e637f24510dd'>gnu: perl-test-trailingspace: Update to 0.0600.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/perl-check.scm (perl-test-trailingspace): Update to 0.0600.
</span></span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2021-02-08 13:46:26 +0200'>2021-02-08</span></td><td><a href='/guix/commit/gnu/packages/perl-check.scm?id=51f8be68316764dbf2a698ab4ffe3e421cf75eb8'>gnu: perl-test-simple: Update to 1.302183.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/perl-check.scm (perl-test-simple): Update to 1.302183.
</span></span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2021-02-08 13:46:25 +0200'>2021-02-08</span></td><td><a href='/guix/commit/gnu/packages/perl-check.scm?id=1e4565eabca2026320eae6ac36b1c3361ddb19f6'>gnu: perl-test-runvalgrind: Update to 0.2.2.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/perl-check.scm (perl-test-runvalgrind): Update to 0.2.2.
</span></span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2021-02-08 13:46:25 +0200'>2021-02-08</span></td><td><a href='/guix/commit/gnu/packages/perl-check.scm?id=072ef70a8e2b61679be25bc0af60d97afb26e827'>gnu: perl-test-requires: Update to 0.11.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/perl-check.scm (perl-test-requires): Update to 0.11.
</span></span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2021-02-08 13:46:25 +0200'>2021-02-08</span></td><td><a href='/guix/commit/gnu/packages/perl-check.scm?id=d2cb69dfd4752ec32de092e5fad92a93caa0861b'>gnu: perl-test-taint: Update to 1.08.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/perl-check.scm (perl-test-taint): Update to 1.08.
</span></span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2021-02-08 13:46:25 +0200'>2021-02-08</span></td><td><a href='/guix/commit/gnu/packages/perl-check.scm?id=bddb78e01a254e27574f0f55d4168816b8268c33'>gnu: perl-test-warnings: Update to 0.030.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/perl-check.scm (perl-test-warnings): Update to 0.030.
</span></span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2021-02-08 13:46:25 +0200'>2021-02-08</span></td><td><a href='/guix/commit/gnu/packages/perl-check.scm?id=6b1fb33bc7509397ee63fcb67b48d7046f202f26'>gnu: perl-test-warn: Update to 0.36.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/perl-check.scm (perl-test-warn): Update to 0.36.
</span></span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2021-01-07 21:45:46 +0100'>2021-01-07</span></td><td><a href='/guix/commit/gnu/packages/perl-check.scm?id=4203024e65925f322860d08cd6870ecf8203aba2'>gnu: perl-test-file: Update to 1.444.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/perl-check.scm (perl-test-file): Update to 1.444.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>