fix build scripts

csrc/zlib/_memcpy.h

@@ -1,2 +0,0 @@
-/* force mempcy to be from earlier compatible system */
-__asm__(".symver memcpy,memcpy@GLIBC_2.2.5");

csrc/zlib/build-linux32.sh

@@ -0,0 +1 @@
+P=linux32 C="-m32 -fPIC" L="-m32 -s -static-libgcc" D=libz.so A=libz.a ./build.sh

csrc/zlib/build-linux64.sh

@@ -1 +1 @@
-P=linux64 C="-fPIC -include _memcpy.h -DHAVE_UNISTD_H" L="-s -static-libgcc" D=libz.so A=libz.a ./build.sh
+P=linux64 C="-fPIC" L="-s -static-libgcc" D=libz.so A=libz.a ./build.sh

csrc/zlib/build-mingw32.sh

@@ -0,0 +1,2 @@
+[ `uname` = Linux ] && { export X=i686-w64-mingw32-; }
+P=mingw32 C="-DZLIB_DLL -fPIC" L="-s -static-libgcc" D=z.dll A=z.a ./build.sh

csrc/zlib/build-mingw64.sh

@@ -1 +1,2 @@
-P=mingw64 C=-DZLIB_DLL L="-s -static-libgcc" D=z.dll A=z.a ./build.sh
+[ `uname` = Linux ] && { export X=x86_64-w64-mingw32-; }
+P=mingw64 C="-DZLIB_DLL -fPIC" L="-s -static-libgcc" D=z.dll A=z.a ./build.sh

csrc/zlib/build-osx64.sh

@@ -1,4 +1,3 @@
-[ `uname` = Linux ] && export X=x86_64-apple-darwin11-
-P=osx64 C="-arch x86_64 -mmacosx-version-min=10.9" \
-	L="-arch x86_64 -mmacosx-version-min=10.9 -install_name @rpath/libz.dylib" \
+[ `uname` = Linux ] && { export X=x86_64-apple-darwin19-; export CC=clang; }
+P=osx64 C="-arch x86_64 -fPIC" L="-arch x86_64 -undefined dynamic_lookup -install_name @rpath/libz.dylib" \
 	D=libz.dylib A=libz.a ./build.sh

csrc/zlib/build.sh

@@ -1,6 +1,7 @@
-${X}gcc -c -O2 $C -DHAVE_MEMCPY *.c -I.
-${X}gcc *.o -shared -o ../../bin/$P/$D $L
+[ "$CC" ] || CC=gcc
+mkdir -p ../../bin/$P
+${X}${CC} -c -O2 $C *.c -I.
+${X}${CC} *.o -shared -o ../../bin/$P/$D $L
 rm -f ../../bin/$P/$A
-rm -f      ../../bin/$P/$A
 ${X}ar rcs ../../bin/$P/$A *.o
 rm *.o