Merge in trunk changes to os_unix.c that allow the code to build on

unix platforms that lack posix_fallocate().

FossilOrigin-Name: bf5764067ab848e19e5971cbdf892c633495e325

diff --cc manifest
index b27c4365532ea4dc37e45f4bb594ef28bf5e6963,aab16234deeed2a00b660c7725bd28d78643f29c..c3f131b5136452c2f480bb67f2bc237d30f69458
--- 1/manifest
--- 2/manifest
+++ b/manifest
@@@ -1,5 -1,5 +1,5 @@@
- C Add\sin\sthe\scost\sof\sdoing\sa\stable\slookup\son\sOR\ssearches.\s\sMake\stest\scase\nchanges\sto\sdeal\swith\sdifference\sin\sSTAT3\sbehavior.
- D 2013-06-19T18:01:44.089
 -C Only\sdefault\sHAVE_POSIX_FALLOCATE\son\sfor\slinux,\sand\sthen\sonly\sif\sit\sis\snot\npreviously\sdefined.
 -D 2013-06-19T14:49:14.627
++C Merge\sin\strunk\schanges\sto\sos_unix.c\sthat\sallow\sthe\scode\sto\sbuild\son\nunix\splatforms\sthat\slack\sposix_fallocate().
++D 2013-06-19T23:48:35.353
  F Makefile.arm-wince-mingw32ce-gcc d6df77f1f48d690bd73162294bbba7f59507c72f
  F Makefile.in 5e41da95d92656a5004b03d3576e8b226858a28e
  F Makefile.linux-gcc 91d710bdc4998cb015f39edf3cb314ec4f4d7e23
@@@ -201,8 -201,8 +201,8 @@@ F src/notify.c 976dd0f6171d4588e89e874f
  F src/os.c b4ad71336fd96f97776f75587cd9e8218288f5be
  F src/os.h 4a46270a64e9193af4a0aaa3bc2c66dc07c29b3f
  F src/os_common.h 92815ed65f805560b66166e3583470ff94478f04
- F src/os_unix.c 42c9b8b7c61c9fa3561258f523be5749e52ed0e0
+ F src/os_unix.c a4c49f855cfd0783d7027a5e20dab6bb10fe4e4b
 -F src/os_win.c 5f018dbd4cec25c5b47e11432b946a7d2ccee60b
 +F src/os_win.c 074cb2b9bca6a1c2bd72acf04666cdc554bfaa9b
  F src/pager.c 79df56da9dd49aceaa4cac207484a9a82cba40ae
  F src/pager.h 5cb78b8e1adfd5451e600be7719f5a99d87ac3b1
  F src/parse.y 9acfcc83ddbf0cf82f0ed9582ccf0ad6c366ff37
@@@ -1094,9 -1092,8 +1094,9 @@@ F tool/tostr.awk e75472c2f98dd76e06b8c9
  F tool/vdbe-compress.tcl f12c884766bd14277f4fcedcae07078011717381
  F tool/warnings-clang.sh f6aa929dc20ef1f856af04a730772f59283631d4
  F tool/warnings.sh fbc018d67fd7395f440c28f33ef0f94420226381
 +F tool/wherecosttest.c f407dc4c79786982a475261866a161cd007947ae
  F tool/win/sqlite.vsix 97894c2790eda7b5bce3cc79cb2a8ec2fde9b3ac
- P 8d2ae8e2f343f82f6fba6d0e89cee7f15b444aa3
- R f44808387531e19eca9d858ab5ea40e0
 -P b9b30d4f9845d212e2d3206abbf2795099e5d71d
 -R 051331ae49dcb9481117487fe2ddd3f7
++P d97898e8e3990ae8c1882c9102b57692d8810730 2b2ade92788be623af6f57e37d98994be2cec142
++R af29521d8d639d3c1ed2b17d2bc51c2a
  U drh
- Z 1152d5230daa64158b83c69b1e514ae0
 -Z f091211d6e3ac84847a4aa6c11062c5e
++Z 42c7b6eae41e304e98ed87b4d40fa5b5

diff --cc manifest.uuid
index 6cc8090fecf8f4952c5d6cdf1f6611e884de3850,edfc6bc72cf0c98208a951bf3128968554c0cf78..f4251023d7dee50846e4671b1bf351d5bba62075
--- 1/manifest.uuid
--- 2/manifest.uuid
+++ b/manifest.uuid
@@@ -1,1 -1,1 +1,1 @@@
- d97898e8e3990ae8c1882c9102b57692d8810730
 -2b2ade92788be623af6f57e37d98994be2cec142
++bf5764067ab848e19e5971cbdf892c633495e325