alloca.3: move to share/man/man3

The alloca() API is a compiler builtin and not generally part of libc.

Reviewed by:	imp
Differential Revision:	https://reviews.freebsd.org/D50055

lib/libc/stdlib/Makefile.inc

@@ -31,7 +31,7 @@ SYM_MAPS+= ${LIBC_SRCTOP}/stdlib/Symbol.map
 # machine-dependent stdlib sources
 .sinclude "${LIBC_SRCTOP}/${LIBC_ARCH}/stdlib/Makefile.inc"
 
-MAN+=	a64l.3 abort.3 abs.3 alloca.3 atexit.3 atof.3 \
+MAN+=	a64l.3 abort.3 abs.3 atexit.3 atof.3 \
 	atoi.3 atol.3 at_quick_exit.3 bsearch.3 \
 	div.3 exit.3 getenv.3 getopt.3 getopt_long.3 getsubopt.3 \
 	hcreate.3 imaxabs.3 imaxdiv.3 insque.3 labs.3 ldiv.3 llabs.3 lldiv.3 \

share/man/man3/Makefile

@@ -1,6 +1,7 @@
 .include <src.opts.mk>
 
-MAN=		arb.3 \
+MAN=		alloca.3 \
+		arb.3 \
 		assert.3 \
 		ATOMIC_VAR_INIT.3 \
 		bitstring.3 \

share/man/man3/alloca.3

@@ -25,14 +25,12 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.Dd September 5, 2006
+.Dd April 29, 2025
 .Dt ALLOCA 3
 .Os
 .Sh NAME
 .Nm alloca
 .Nd memory allocator
-.Sh LIBRARY
-.Lb libc
 .Sh SYNOPSIS
 .In stdlib.h
 .Ft void *