2.1.1 can't be built without git

[saaros]

From #11 (comment)

Hi,

the 2.1.1 build throws some strange git errors while doing a make and make install:

# make
fatal: Not a git repository (or any of the parent directories): .git
fatal: Not a git repository (or any of the parent directories): .git
fatal: Not a git repository (or any of the parent directories): .git
fatal: Not a git repository (or any of the parent directories): .git
fatal: Not a git repository (or any of the parent directories): .git
cp -fp ext/pgmemcache.sql pgmemcache--.sql
fatal: Not a git repository (or any of the parent directories): .git
sed -e 's,__short_ver__,,g' < ext/pgmemcache.control > pgmemcache.control
gcc -g -O2 -fPIC -pie -I/usr/include/mit-krb5 -DLINUX_OOM_ADJ=0 -fPIC -pie -I/usr/include/mit-krb5 -DLINUX_OOM_ADJ=0 -Wall -Wmissing-prototypes                   -Wpointer-arith -Wdeclaration-after-statement -Wendif-labels -Wmissing-format-attribute -Wformat-security -fno-strict-aliasing -fwrapv -g -fpic                   -I. -I. -I/usr/include/postgresql/9.2/server -I/usr/include/postgresql/internal -D_GNU_SOURCE -I/usr/include/libxml2  -I/usr/include/tcl8.5  -c                   -o pgmemcache.o pgmemcache.c
gcc -g -O2 -fPIC -pie -I/usr/include/mit-krb5 -DLINUX_OOM_ADJ=0 -fPIC -pie -I/usr/include/mit-krb5 -DLINUX_OOM_ADJ=0 -Wall -Wmissing-prototypes                   -Wpointer-arith -Wdeclaration-after-statement -Wendif-labels -Wmissing-format-attribute -Wformat-security -fno-strict-aliasing -fwrapv -g -fpic                   -shared -o pgmemcache.so pgmemcache.o -L/usr/lib -Wl,--as-needed -L/usr/lib/mit-krb5 -L/usr/lib//mit-krb5 -Wl,--as-needed -L/usr/lib/mit-krb5 -L                  /usr/lib//mit-krb5  -Wl,--as-needed  -lmemcached -lsasl2

The generated files have errors too:

# CREATE EXTENSION pgmemcache;
ERROR:  invalid extension version name: ""
DETAIL:  Version names must not be empty.

# CREATE EXTENSION pgmemcache WITH VERSION '2.1.1';
ERROR:  could not stat file "/usr/share/postgresql/9.2/extension/pgmemcache--2.1.1.sql": No such file or directory

The extension file is missing the version:

/usr/share/postgresql/9.2/extension/pgmemcache--.sql

Version 2.1.0 works fine.

Cheers,
Patryk