- check with -j1

- Fix SRPM group and grammar issues.

- removed obsoleted Obsoletes

- update to 1.6.34:
* Removed contrib/pngsuite/i*.png; some of these were incorrect
and caused test failures.
- includes 1.6.33:
* Added PNGMINUS_UNUSED macro to contrib/pngminus/p*.c and added
missing parenthesis in contrib/pngminus/pnm2png.c
* Fixed off-by-one error in png_do_check_palette_indexes()
* Initialize png_handler.row_ptr in libpng_read_fuzzer.cc
to fix shortlived oss-fuzz issue 3234.
* Compute a larger limit on IDAT because some applications write
a deflate buffer for each row
* Use current date (DATE) instead of release-date (RDATE) in last
changed date of contrib/oss-fuzz files.
* Enabled ARM support in CMakeLists.txt
* Fixed incorrect typecast of some arguments to png_malloc() and
png_calloc() that were png_uint_32 instead of png_alloc_size_t
* Use pnglibconf.h.prebuilt when building for ANDROID with cmake
* Initialize memory allocated by png_inflate to zero, using
memset, to stop an oss-fuzz "use of uninitialized value"
detection in png_set_text_2() due to truncated iTXt or zTXt
chunk.
* Initialize memory allocated by png_read_buffer to zero, using
memset, to stop an oss-fuzz "use of uninitialized value"
detection in png_icc_check_tag_table() due to truncated iCCP