tools/7z: Allow building on alpine

When using alpine as host, things start to fail. Lets pull in the
upstream alpine patches to make things work. This should not affect
other hosts.

Note, that Alpine has the '_GNU_SOURCE' define in the APKBUILD file, but
here we add this flag to the needed fix flags patch, which does similar
things too.

Signed-off-by: Olliver Schinagl <oliver@schinagl.nl>

tools/7z/patches/7-zip-flags.patch

@@ -0,0 +1,27 @@
+--- a/CPP/7zip/7zip_gcc.mak
++++ b/CPP/7zip/7zip_gcc.mak
+@@ -18,13 +18,13 @@ PROGPATH_STATIC = $(O)/$(PROG)s
+ 
+ 
+ ifneq ($(CC), xlc)
+-CFLAGS_WARN_WALL = -Wall -Werror -Wextra
++CFLAGS_WARN_WALL = -Wall -Wextra
+ endif
+ 
+ # for object file
+ CFLAGS_BASE_LIST = -c
+ # CFLAGS_BASE_LIST = -S
+-CFLAGS_BASE = -O2 $(CFLAGS_BASE_LIST) $(CFLAGS_WARN_WALL) $(CFLAGS_WARN) \
++CFLAGS_BASE = $(CFLAGS_BASE_LIST) $(CFLAGS_WARN_WALL) $(CFLAGS_WARN) -D_GNU_SOURCE \
+  -DNDEBUG -D_REENTRANT -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE \
+  -fPIC
+ 
+@@ -192,7 +192,7 @@ all: $(O) $(PROGPATH) $(STATIC_TARGET)
+ $(O):
+ 	$(MY_MKDIR) $(O)
+ 
+-LFLAGS_ALL = -s $(MY_ARCH_2) $(LDFLAGS) $(LD_arch) $(OBJS) $(MY_LIBS) $(LIB2)
++LFLAGS_ALL = $(MY_ARCH_2) $(LDFLAGS) $(LD_arch) $(OBJS) $(MY_LIBS) $(LIB2)
+ $(PROGPATH): $(OBJS)
+ 	$(CXX) -o $(PROGPATH) $(LFLAGS_ALL)
+ 

tools/7z/patches/7-zip-musl.patch

@@ -0,0 +1,59 @@
+--- a/C/CpuArch.c
++++ b/C/CpuArch.c
+@@ -421,8 +421,6 @@ BoolInt CPU_IsSupported_AES (void) { ret
+ 
+ #ifdef USE_HWCAP
+ 
+-#include <asm/hwcap.h>
+-
+   #define MY_HWCAP_CHECK_FUNC_2(name1, name2) \
+   BoolInt CPU_IsSupported_ ## name1() { return (getauxval(AT_HWCAP)  & (HWCAP_  ## name2)) ? 1 : 0; }
+ 
+--- a/C/Threads.c
++++ b/C/Threads.c
+@@ -257,7 +257,7 @@ WRes Thread_Create_With_CpuSet(CThread *
+       */
+ 
+       // ret2 =
+-      pthread_attr_setaffinity_np(&attr, sizeof(*cpuSet), cpuSet);
++      //pthread_attr_setaffinity_np(&attr, sizeof(*cpuSet), cpuSet);
+       // if (ret2) ret = ret2;
+       #endif
+     }
+@@ -267,14 +267,12 @@ WRes Thread_Create_With_CpuSet(CThread *
+     if (!ret)
+     {
+       p->_created = 1;
+-      /*
+       if (cpuSet)
+       {
+         // ret2 =
+         pthread_setaffinity_np(p->_tid, sizeof(*cpuSet), cpuSet);
+         // if (ret2) ret = ret2;
+       }
+-      */
+     }
+   }
+   // ret2 =
+--- a/C/Threads.h
++++ b/C/Threads.h
+@@ -19,6 +19,7 @@
+ #endif
+ 
+ #include <pthread.h>
++#include <sched.h>
+ 
+ #endif
+ 
+--- a/CPP/Windows/SystemInfo.cpp
++++ b/CPP/Windows/SystemInfo.cpp
+@@ -36,9 +36,6 @@
+ #endif
+ */
+ 
+-#ifdef MY_CPU_ARM_OR_ARM64
+-#include <asm/hwcap.h>
+-#endif
+ #endif
+ 
+ #ifdef __linux__