Bug 1225869

GCC 14 newly by default treats as errors a number of situations which
before were only warnings.  For more information see
https://gcc.gnu.org/gcc-14/porting_to.html and meta bug #1220571.

Because of this, package openblas flavors openmp, pthreads and serial
fails to compile.  This can be seen online at:
 - https://build.opensuse.org/package/live_build_log/openSUSE:Factory:Staging:Gcc7/openblas:openmp/standard/x86_64
 - https://build.opensuse.org/package/live_build_log/openSUSE:Factory:Staging:Gcc7/openblas:openmp/standard/x86_64
 - https://build.opensuse.org/package/live_build_log/openSUSE:Factory:Staging:Gcc7/openblas:serial/standard/x86_64
 
It can be reproduced locally with command: osc build --clean
--alternative-project home:rguenther:nextgcc

Patches that Fedora used to overcome these new errors are listed at:
https://gitlab.com/fweimer-rh/fedora-modernc/-/blob/main/pkg/o/openblas.md?ref_type=heads


The (first) error (that halts the build) is:

[   14s] ../common_stackalloc.h:59:10: error: assignment to ‘bfloat16 *’ {aka ‘short unsigned int *’} from incompatible pointer type ‘float *’ [-Wincompatible-pointer-types]
[   14s]    59 |   BUFFER = stack_alloc_size ? stack_buffer : (TYPE *)blas_memory_alloc(1);
[   14s]       |          ^
[   14s] gemmt.c:481:25: note: in expansion of macro ‘STACK_ALLOC’
[   14s]   481 |                         STACK_ALLOC(buffer_size, FLOAT, buffer);
[   14s]       |                         ^~~~~~~~~~~