uselib.2, posix_memalign.3, profil.3, rtime.3: Remove some text about libc/libc5

With this change, there remain almost no vestiges of information
about the long defunct Linux libc.

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

man2/uselib.2

@@ -89,28 +89,28 @@ it was sufficient to manually declare the interface in your code;
 alternatively, you could invoke the system call using
 .BR syscall (2).
 .PP
-In ancient libc versions,
+In ancient libc versions (before glibc 2.0),
 .BR uselib ()
 was used to load
 the shared libraries with names found in an array of names
 in the binary.
-.PP
-.\" libc 4.3.1f - changelog 1993-03-02
-Since libc 4.3.2, startup code tries to prefix these names
-with "/usr/lib", "/lib" and "" before giving up.
-.\" libc 4.3.4 - changelog 1993-04-21
-In libc 4.3.4 and later these names are looked for in the directories
-found in
-.BR LD_LIBRARY_PATH ,
-and if not found there,
-prefixes "/usr/lib", "/lib" and "/" are tried.
-.PP
-From libc 4.4.4 on only the library "/lib/ld.so" is loaded,
-so that this dynamic library can load the remaining libraries needed
-(again using this call).
-This is also the state of affairs in libc5.
-.PP
-glibc2 does not use this call.
+.\" .PP
+.\" .\" libc 4.3.1f - changelog 1993-03-02
+.\" Since libc 4.3.2, startup code tries to prefix these names
+.\" with "/usr/lib", "/lib" and "" before giving up.
+.\" .\" libc 4.3.4 - changelog 1993-04-21
+.\" In libc 4.3.4 and later these names are looked for in the directories
+.\" found in
+.\" .BR LD_LIBRARY_PATH ,
+.\" and if not found there,
+.\" prefixes "/usr/lib", "/lib" and "/" are tried.
+.\" .PP
+.\" From libc 4.4.4 on only the library "/lib/ld.so" is loaded,
+.\" so that this dynamic library can load the remaining libraries needed
+.\" (again using this call).
+.\" This is also the state of affairs in libc5.
+.\" .PP
+.\" glibc2 does not use this call.
 .PP
 Since Linux 3.15,
 .\" commit 69369a7003735d0d8ef22097e27a55a8bad9557a

man3/posix_memalign.3

@@ -245,7 +245,8 @@ is declared in \fI<stdlib.h>\fP instead of \fI<malloc.h>\fP.
 According to SUSv2,
 .BR valloc ()
 is declared in \fI<stdlib.h>\fP.
-Libc4,5 and glibc declare it in \fI<malloc.h>\fP, and also in
+.\" Libc4,5 and
+Glibc declares it in \fI<malloc.h>\fP, and also in
 \fI<stdlib.h>\fP
 if suitable feature test macros are defined (see above).
 .SH NOTES

man3/profil.3

@@ -98,7 +98,7 @@ interval timers (see
 .BR setitimer (2)).
 .PP
 True kernel profiling provides more accurate results.
-Libc 4.4 contained a kernel patch providing a system call profil.
+.\" Libc 4.4 contained a kernel patch providing a system call profil.
 .SH SEE ALSO
 .BR gprof (1),
 .BR sprof (1),

man3/rtime.3

@@ -75,17 +75,17 @@ versions support only TCP.
 Try the example program with
 .I use_tcp
 set to 1.
-.PP
-Libc5 uses the prototype
-.PP
-.nf
-    int rtime(struct sockaddr_in *, struct timeval *, struct timeval *);
-.fi
-.PP
-and requires
-.I <sys/time.h>
-instead of
-.IR <rpc/auth_des.h> .
+.\" .PP
+.\" Libc5 uses the prototype
+.\" .PP
+.\" .nf
+.\"    int rtime(struct sockaddr_in *, struct timeval *, struct timeval *);
+.\" .fi
+.\" .PP
+.\" and requires
+.\" .I <sys/time.h>
+.\" instead of
+.\" .IR <rpc/auth_des.h> .
 .SH BUGS
 .BR rtime ()
 in glibc 2.2.5 and earlier does not work properly on 64-bit machines.