[DO-971] ffmpeg recipe with requirements (!9)

Co-authored-by: aleksandr.vodyanov <aleksandr.vodyanov@avroid.tech>
Reviewed-on: https://git.avroid.tech/Conan/conan_build/pulls/9

recipes/libcap/all/patches/2.57/0001-libcap-Remove-hardcoded-fPIC.patch

@@ -0,0 +1,27 @@
+From b70454fccba1816b14d50813b1715e9a50d7cca0 Mon Sep 17 00:00:00 2001
+From: Sergey Bobrenok <bobrofon@gmail.com>
+Date: Sat, 11 Sep 2021 20:39:49 +0300
+Subject: [PATCH 1/2] libcap: Remove hardcoded -fPIC
+
+Signed-off-by: Sergey Bobrenok <bobrofon@gmail.com>
+---
+ libcap/Makefile | 3 ---
+ 1 file changed, 3 deletions(-)
+
+diff --git a/libcap/Makefile b/libcap/Makefile
+index 7706063..1b52eb9 100644
+--- a/libcap/Makefile
++++ b/libcap/Makefile
+@@ -18,9 +18,6 @@ CAPMAGICOBJ=cap_magic.o
+ PSXFILES=../psx/psx
+ PSXMAGICOBJ=psx_magic.o
+ 
+-# Always build libcap sources this way:
+-CFLAGS += -fPIC
+-
+ # The linker magic needed to build a dynamic library as independently
+ # executable
+ MAGIC=-Wl,-e,__so_start
+-- 
+2.31.1
+

recipes/libcap/all/patches/2.57/0002-Make.Rules-Make-compile-tools-configurable.patch

@@ -0,0 +1,33 @@
+From a38f5a330d65cc877fcc1da02836526d11ead4f0 Mon Sep 17 00:00:00 2001
+From: Sergey Bobrenok <bobrofon@gmail.com>
+Date: Sat, 11 Sep 2021 20:44:07 +0300
+Subject: [PATCH 2/2] Make.Rules: Make compile tools configurable
+
+Signed-off-by: Sergey Bobrenok <bobrofon@gmail.com>
+---
+ Make.Rules | 8 ++++----
+ 1 file changed, 4 insertions(+), 4 deletions(-)
+
+diff --git a/Make.Rules b/Make.Rules
+index 00f2a03..34831ae 100644
+--- a/Make.Rules
++++ b/Make.Rules
+@@ -66,11 +66,11 @@ DEFINES := -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64
+ SYSTEM_HEADERS = /usr/include
+ 
+ SUDO := sudo
+-CC := $(CROSS_COMPILE)gcc
++CC ?= $(CROSS_COMPILE)gcc
+ LD := $(CC) -Wl,-x -shared
+-AR := $(CROSS_COMPILE)ar
+-RANLIB := $(CROSS_COMPILE)ranlib
+-OBJCOPY := $(CROSS_COMPILE)objcopy
++AR ?= $(CROSS_COMPILE)ar
++RANLIB ?= $(CROSS_COMPILE)ranlib
++OBJCOPY ?= $(CROSS_COMPILE)objcopy
+ 
+ # Reference:
+ #   CPPFLAGS used for building .o files from .c & .h files
+-- 
+2.31.1
+